Literature DB >> 35974835

Crystal structure, Hirshfeld surface and frontier mol-ecular orbital analysis of 10-benzyl-9-(4-hydroxy-3-meth-oxy-phen-yl)-3,3,6,6-tetra-methyl-3,4,6,7,9,10-hexa-hydro-acridine-1,8(2H,5H)-dione.

V Sughanya1, B Loganathan2, D Praveenkumar3, J Ayyappan4, M L Sundararajan5, A Prabhakaran6, A Dhandapani6, N Suresh Babu7.   

Abstract

In the fused ring system of the title mol-ecule, C31H35NO4, the conformation of the central di-hydro-pyridine ring is inter-mediate between boat and envelope with the N and the opposite C atoms lying out of the basal plane. The conformations of terminal rings are close to envelope, with the atoms substituted by two methyl groups as the flaps. In the crystal, the mol-ecules are linked by O-H⋯O hydrogen bonds into helical chains. The Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (63.2%), O⋯H/H⋯O (20.1%) and C⋯H/H⋯C (14.4%) contacts. Quantum chemical calculations of the frontier mol-ecular orbitals were carried out to characterize the chemical reactivity of the title compound. © Sughanya et al. 2022.

Entities:  

Keywords:  Hirshfeld analysis; acridinedione; benzyl­amine; crystal structure; frontier orbitals; hydrogen bonding

Year:  2022        PMID: 35974835      PMCID: PMC9361374          DOI: 10.1107/S2056989022006557

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

The acridine fragment is a part of a number of naturally occurring substances, and its derivatives have been used as photoinitiators. Acridine-1,8-diones have been shown to have very high lasing efficiencies and have been used as dyes (Niknam & Damya, 2009 ▸). Some acridine derivatives (Nasim & Brychcy, 1979 ▸; Thull & Testa, 1994 ▸), also well known as therapeutic agents, have a wide range of applications in the pharmaceutical and dye industries. These include compounds that are used as anti-cancer (Sondhi et al., 2004 ▸; Sugaya et al., 1994 ▸; Kimura et al., 1993 ▸), anti-tubercular (Aly & Abadi, 2004 ▸; Tripathi et al., 2006 ▸), anti-inflammatory (Chen et al., 2002 ▸), anti-malarial (Kumar et al., 2009 ▸; Tomar et al., 2010 ▸), anti-viral (Gupta & Jaiswal, 2010 ▸; Tonelli et al., 2011 ▸), anti-parasitic (Di Giorgio, et al., 2005 ▸) and fungicidal agents (Srivastava & Nizamuddin, 2004 ▸). In this context, we report here the synthesis, crystal structure, Hirshfeld surface and frontier mol­ecular orbital analysis of the title acridine-1,8-dione derivative.

Structural commentary

The title compound (Fig. 1 ▸) crystallizes in the monoclinic space group P21/n with Z = 4. The conformation of the central di­hydro­pyridine ring is inter­mediate between boat and envelope: four atoms (C8, C9, C17 and C18) form the basal plane with a deviation of 0.008 (2) Å for all of them, whereas atoms N1 and C16 deviate from this plane by 0.168 (2) and 0.476 (2) Å, respectively. The conformations of the terminal C8–C13 and C17–C22 rings are close to envelope with C12 and C20, respectively, as the flap atoms. The basal planes of these envelopes are twisted, and the deviations of corresponding atoms from their least-squares planes are between 0.005 (2) and 0.100 (2) Å. The N1 atom has an essentially planar environment, deviating from the plane through atoms C7, C8 and C18 by only 0.018 (2) Å. The bond lengths in the N1—C8—C9—C10—O2 and N1—C18—C17—C22—O chains indicate π-conjugation of N1 with the carbonyl groups C10=O2 and C22=O1 (Table 1 ▸). All other bond lengths and angles in the title structure are within the ranges normal for analogous compounds (Allen et al., 1987 ▸; Thamotharan et al., 2021 ▸; Allah et al., 2021 ▸; Mohamed et al., 2013 ▸; Akkurt et al., 2014 ▸).
Figure 1

The mol­ecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level.

Table 1

Selected bond lengths (Å)

C8—C91.365 (3)C17—C181.367 (3)
C8—N11.404 (3)C17—C221.459 (3)
C9—C101.462 (3)C18—N11.400 (3)
C10—O21.236 (3)C22—O11.240 (3)

Supra­molecular features and Hirshfeld analysis

In the crystal, the mol­ecules are linked via O3—H3A⋯O1i hydrogen bonds [symmetry code (i): −x +  , y −  , −z +  ] forming helical chains along the b-axis direction (Fig. 2 ▸, Table 2 ▸). The chains are further connected by weak C7—H7B⋯O1ii hydrogen bonds [symmetry code (ii): x −  , −y +  , z −  ] forming sheets parallel to (10 ).
Figure 2

Packing view of the title compound showing the O—H⋯O inter­molecular hydrogen bonds.

Table 2

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
O3—H3A⋯O1i 0.94 (4)2.07 (4)2.780 (2)131 (3)
C7—H7B⋯O1ii 0.972.413.260 (3)146

Symmetry codes: (i) ; (ii) .

To qu­antify the inter­molecular contacts in the crystal, Hirshfeld surfaces and two-dimensional fingerprint plots were generated using Crystal Explorer (Version 17.5; Turner et al., 2017 ▸). The Hirshfeld surface mapped over d norm in the range −0.436 to 1.583 a.u. (Fig. 3 ▸) show the inter­molecular contacts as red-coloured spots, which indicate the C—H⋯O and O—H⋯O hydrogen bonds. The red and blue regions corresponding to negative (hydrogen-bond acceptors) and positive (hydrogen-bond donors) potentials on the Hirshfeld surface mapped over electrostatic potential are shown in Fig. 4 ▸. The two-dimensional fingerprint plots are presented in Fig. 5 ▸. The H⋯H contacts comprise 63.2% of the total inter­actions. Besides these contacts, O⋯H/H⋯O (20.1%) and C⋯H/H⋯C (14.4%) inter­actions make significant contributions to the total Hirshfeld surface. The percentage contributions of the N⋯C/C⋯N, C⋯O/H⋯O, and C⋯C contacts are 0.3, 1.2 and 0.5%, respectively.
Figure 3

View of the three-dimensional Hirshfeld surface of the title mol­ecule plotted over d norm in the range −0.436 to 1.583 a.u.

Figure 4

View of the three-dimensional Hirshfeld surface of the title mol­ecule plotted over electrostatic potential energy in the range −0.0500 to 0.0500 a.u. calculated with the STO-3 G basis set at the Hartree–Fock level of theory. The hydrogen-bond donating and acceptor areas are viewed as blue and red regions, respectively, around atoms, corresponding to positive and negative potentials.

Figure 5

The two-dimensional fingerprint plot showing all inter­actions and those delineated into C⋯H/H⋯C, C⋯O/O⋯H, C⋯C, H⋯H, O⋯H/H⋯O and N⋯C/C⋯N contacts.

Frontier mol­ecular orbital analysis

The chemical reactivity of the title compound was studied by frontier mol­ecular orbital analysis. For the calculation, the mol­ecular structure obtained from X-ray diffraction data was used as the mol­ecular model. The energy levels, summarized in Table 3 ▸, were computed at the DFT-B3LYP/6-311G++(d,p) level of theory as implemented in Gaussian09W (Frisch et al., 2013 ▸). The calculated frontier mol­ecular orbitals, LUMO+1, LUMO, HOMO, and HOMO-1, are shown in Fig. 6 ▸. The energies of LUMO+1, LUMO, HOMO and HOMO−1 were calculated to be −0.9021, −1.7652, −5.5800 and −5.9005 eV, respectively, and the energies required to excite one electron from HOMO−1 to LUMO+1 and from HOMO to LUMO are 4.9984 and 3.8148 eV, respectively. The chemical hardness, chemical potential, chemical softness and electrophilicity index of the title mol­ecule are listed in Table 4 ▸. The electrophilicity index value of 3.3429 eV shows the global electrophilic nature of the mol­ecule. Based on the wide band gap and chemical hardness value of 2.0174 eV, the title mol­ecule seems to be hard.
Table 3

The frontier mol­ecular orbital energies of title compound

Orbitalsa.ueVType
V 136 −0.00997−0.27129LUMO+5
V 135 −0.02093−0.56953LUMO+4
V 134 −0.02288−0.62260LUMO+3
V 133 −0.02951−0.80301LUMO+2
V 132 −0.03315−0.90205LUMO+1
V 131 −0.06487−1.76519LUMO
O 130 −0.20506−5.57995HOMO
O 129 −0.21684−5.90050HOMO−1
O 128 −0.23178−6.30704HOMO−2
O 127 −0.23655−6.43684HOMO−3
O 126 −0.24414−6.64337HOMO−4
O 125 −0.26023−7.08120HOMO−5
Figure 6

The frontier mol­ecular orbitals of the title mol­ecule.

Table 4

The global reactivity descriptors of the title compound (eV)

Frontier mol­ecular orbitalsEnergy
E HOMO −5.5800
E LUMO −1.7652
E HOMO-1 −5.9005
E LUMO+1 −0.9021
(E HOMOE LUMO) gap3.8148
(E HOMO-100E LUMO+1) gap4.9984
Chemical potential (μ)3.6726
Chemical hardness (η)2.0017
Chemical softness (S)0.4957
Electrophilicity index (ω)3.3429

Database survey

A search of the Cambridge Structural Database (CSD, Version 5.43, updated September 2021; Groom et al., 2016 ▸) for the acridine-1,8(2H)dione unit resulted in 22 hits. They include the following acridine-1,8(2H)dione derivatives similar to the title compound: 4-eth­oxy­phenyl (QEDYAB; Sughanya & Sureshbabu, 2012 ▸), 3,4-di­meth­oxy­phenyl (PUSJEU; Sureshbabu & Sughanya, 2015 ▸) and 3-eth­oxy-4-hy­droxy­phenyl (MULWUO; Suresh Babu et al., 2020 ▸). In the title compound, the dihedral angle between the phenyl and di­hydro­pyridine rings is 85.39 (2)°, similar to the values observed for the 4-eth­oxy­phenyl analogue QEDYAB, the 3,4-di­meth­oxy­phenyl analogue PUSJEU, and 3-eth­oxy-4-hy­droxy­phenyl analogue MULWUO, for which the dihedral angles are 75.20 (4), 89.47 (9) and 85.81 (2)°, respectively.

Synthesis and crystallization

A mixture of benzyl­amine (0.214g, 2 mmol), 4-hy­droxy-3-meth­oxy­benzaldehyde (0.304g, 2 mmol) and 5,5-di­methyl­cyclo­hexane-1,3-dione (0.56g, 4 mmol) was dissolved in 25 ml of acetic acid. The solution was refluxed for 2 h with the reaction being monitored by TLC. After the reaction was about to the end, the reaction mixture was poured into 150 ml of ice-cold water, stirred at 298–303K for 10 min and then kept at room temperature for 12 h. The solid was filtered, washed repeatedly with water and dried. Yellow single crystals suitable for X-ray diffraction were obtained from 95% ethanol (m.p. 483 K, 0.718 g, 1.48 mmol, yield 74%). IR (KBr): cm−1 2957-2871, 1634, 1455, 1373. 1H NMR(400 MHz, CDCl3): 0.90 (s, 6H), 0.99 (s, 6H), 2.21 (s, 4H), 2.40 (dd, 4H), 3.86 (s, 3H), 4.90 (s, 2H), 5.24 (s, 1H), 5.51 (s, 1H), 6.56 (d, 1H), 6.70 (d, 1H), 7.12 (d, 1H), 7.17 (s, 2H), 7.35–7.40 (m, 3H). 13C NMR (100 MHz, CDCl3): 28.11, 28.65, 31.70, 32.73, 40.27, 48.73, 50.05, 55.88, 111.90, 113.60, 115.44, 119.45, 125.38, 128.01, 129.25, 137.10, 138.36, 143.69, 145.92, 150.31, 195.90. ESI–MS: m/z:485.12 [M + H]+.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 5 ▸. Hydrogen atoms were fixed geometrically and treated as riding atoms, with C—H = 0.93–0.97 Å and U iso(H) = 1.2U eq(C) or 1.5U eq(C-meth­yl).
Table 5

Experimental details

Crystal data
Chemical formulaC31H35NO4
M r 485.60
Crystal system, space groupMonoclinic, P21/n
Temperature (K)296
a, b, c (Å)10.4430 (6), 18.4563 (11), 14.2378 (9)
β (°)107.930 (2)
V3)2610.9 (3)
Z 4
Radiation typeMo Kα
μ (mm−1)0.08
Crystal size (mm)0.40 × 0.30 × 0.20
 
Data collection
DiffractometerBruker Kappa APEXII
Absorption correctionMulti-scan (SADABS; Bruker, 2016)
T min, T max 0.953, 0.982
No. of measured, independent and observed [I > 2σ(I)] reflections37271, 5135, 3061
R int 0.096
(sin θ/λ)max−1)0.617
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.052, 0.145, 1.02
No. of reflections5135
No. of parameters330
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)0.19, −0.19

Computer programs: APEX2, SAINT and XPREP (Bruker, 2016 ▸), SHELXT2018 (Sheldrick, 2015a ▸), SHELXL2018 (Sheldrick, 2015b ▸), ORTEP-3 for Windows (Farrugia, 2012 ▸), Mercury (Macrae et al., 2020 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S2056989022006557/yk2171sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989022006557/yk2171Isup2.hkl Click here for additional data file. Supporting information file. DOI: 10.1107/S2056989022006557/yk2171Isup3.cml CCDC reference: 2153580 Additional supporting information: crystallographic information; 3D view; checkCIF report
C31H35NO4Dx = 1.235 Mg m3
Mr = 485.60Melting point: 483 K
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
a = 10.4430 (6) ÅCell parameters from 3522 reflections
b = 18.4563 (11) Åθ = 2.4–21.4°
c = 14.2378 (9) ŵ = 0.08 mm1
β = 107.930 (2)°T = 296 K
V = 2610.9 (3) Å3BLOCK, yellow
Z = 40.40 × 0.30 × 0.20 mm
F(000) = 1040
Bruker Kappa APEXII diffractometer5135 independent reflections
Radiation source: fine-focus sealed tube3061 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.096
ω and φ scanθmax = 26.0°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Bruker, 2016)h = −12→12
Tmin = 0.953, Tmax = 0.982k = −22→22
37271 measured reflectionsl = −17→17
Refinement on F2Hydrogen site location: mixed
Least-squares matrix: fullH atoms treated by a mixture of independent and constrained refinement
R[F2 > 2σ(F2)] = 0.052w = 1/[σ2(Fo2) + (0.049P)2 + 1.0354P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.145(Δ/σ)max < 0.001
S = 1.02Δρmax = 0.19 e Å3
5135 reflectionsΔρmin = −0.19 e Å3
330 parametersExtinction correction: SHELXL-2018 (Sheldrick 2015b), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
0 restraintsExtinction coefficient: 0.0095 (9)
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
xyzUiso*/Ueq
C10.4603 (3)0.09167 (14)0.35227 (19)0.0494 (7)
H10.4103970.0897680.3962050.059*
C20.5467 (3)0.03535 (15)0.3501 (2)0.0594 (8)
H20.554683−0.0039550.3923920.071*
C30.6205 (3)0.03758 (19)0.2855 (3)0.0730 (9)
H30.678749−0.0002350.2840670.088*
C40.6087 (3)0.0954 (2)0.2230 (3)0.0783 (10)
H40.6584790.0965540.1789170.094*
C50.5225 (3)0.15239 (16)0.2254 (2)0.0600 (8)
H50.5156440.1916850.1832410.072*
C60.4467 (2)0.15115 (13)0.28985 (17)0.0387 (6)
C70.3509 (2)0.21207 (12)0.29182 (16)0.0373 (6)
H7A0.3638730.2514250.2504930.045*
H7B0.2590840.1949590.2646970.045*
C80.2902 (2)0.21609 (11)0.44966 (16)0.0315 (5)
C90.3279 (2)0.22925 (11)0.54880 (16)0.0324 (5)
C100.2338 (2)0.21768 (12)0.60510 (18)0.0397 (6)
C110.0907 (2)0.19725 (14)0.54753 (19)0.0486 (7)
H11A0.0405470.2407590.5209220.058*
H11B0.0480530.1746970.5917470.058*
C120.0856 (2)0.14502 (13)0.46279 (18)0.0415 (6)
C130.1588 (2)0.17948 (13)0.39549 (17)0.0387 (6)
H13A0.1762860.1421450.3530900.046*
H13B0.0995390.2149450.3534600.046*
C140.1542 (3)0.07360 (14)0.5055 (2)0.0621 (8)
H14A0.1512470.0407400.4526070.093*
H14B0.2462830.0828280.5429750.093*
H14C0.1081580.0525240.5476910.093*
C15−0.0603 (3)0.12956 (17)0.4002 (2)0.0640 (8)
H15A−0.0606870.0967910.3477600.096*
H15B−0.1081690.1081610.4410020.096*
H15C−0.1033530.1740840.3727390.096*
C160.4694 (2)0.25611 (11)0.60194 (15)0.0321 (5)
H160.4671800.2836420.6602690.039*
C170.5082 (2)0.30702 (11)0.53197 (16)0.0317 (5)
C180.4708 (2)0.29183 (11)0.43328 (16)0.0314 (5)
C190.5302 (2)0.33043 (12)0.36254 (17)0.0390 (6)
H19A0.4608730.3603470.3186040.047*
H19B0.5569070.2945090.3224960.047*
C200.6522 (2)0.37834 (13)0.41290 (18)0.0408 (6)
C210.6196 (3)0.42101 (13)0.49464 (19)0.0487 (7)
H21A0.6969400.4503410.5288840.058*
H21B0.5451780.4535670.4649920.058*
C220.5830 (2)0.37329 (12)0.56887 (17)0.0363 (5)
C230.7793 (2)0.33202 (16)0.4554 (2)0.0584 (8)
H23A0.7980300.3056760.4030070.088*
H23B0.8541050.3629320.4869680.088*
H23C0.7650970.2985260.5028520.088*
C240.6754 (3)0.43065 (15)0.3363 (2)0.0599 (8)
H24A0.6958270.4035670.2851060.090*
H24B0.5956670.4589640.3081090.090*
H24C0.7492940.4622230.3675360.090*
C250.5679 (2)0.19226 (11)0.63605 (16)0.0323 (5)
C260.6453 (2)0.16638 (12)0.57974 (17)0.0382 (6)
H260.6406480.1891080.5204780.046*
C270.7300 (2)0.10688 (12)0.61051 (18)0.0422 (6)
H270.7800020.0900400.5710650.051*
C280.7407 (2)0.07262 (12)0.69872 (17)0.0383 (6)
C290.6655 (2)0.09867 (12)0.75739 (16)0.0363 (5)
C300.5783 (2)0.15702 (12)0.72569 (16)0.0361 (5)
H300.5263560.1728750.7642430.043*
C310.6164 (3)0.08606 (17)0.9100 (2)0.0762 (10)
H31A0.6392540.0560290.9678480.114*
H31B0.6414370.1352790.9287490.114*
H31C0.5212700.0835100.8773690.114*
N10.37180 (17)0.23959 (9)0.39359 (13)0.0323 (4)
O10.61215 (17)0.39158 (9)0.65671 (12)0.0508 (5)
O20.26832 (18)0.22551 (11)0.69568 (13)0.0585 (5)
O30.82731 (18)0.01471 (9)0.72534 (15)0.0533 (5)
O40.68627 (18)0.06155 (9)0.84518 (13)0.0554 (5)
H3A0.819 (3)−0.009 (2)0.782 (3)0.113 (14)*
U11U22U33U12U13U23
C10.0509 (15)0.0494 (16)0.0490 (16)0.0025 (13)0.0172 (13)−0.0031 (13)
C20.0593 (18)0.0502 (17)0.0631 (19)0.0088 (14)0.0105 (15)−0.0073 (15)
C30.065 (2)0.075 (2)0.076 (2)0.0198 (17)0.0177 (18)−0.0218 (19)
C40.074 (2)0.100 (3)0.075 (2)0.011 (2)0.0425 (18)−0.017 (2)
C50.0650 (18)0.072 (2)0.0508 (17)−0.0001 (16)0.0284 (14)−0.0038 (15)
C60.0358 (12)0.0447 (14)0.0335 (13)−0.0070 (11)0.0076 (10)−0.0110 (11)
C70.0415 (13)0.0401 (13)0.0287 (12)−0.0049 (11)0.0087 (10)−0.0021 (10)
C80.0337 (12)0.0270 (11)0.0333 (12)0.0029 (9)0.0093 (10)0.0006 (10)
C90.0344 (12)0.0309 (12)0.0322 (12)0.0036 (10)0.0105 (10)0.0020 (10)
C100.0458 (14)0.0376 (13)0.0374 (14)0.0045 (11)0.0155 (11)0.0015 (11)
C110.0424 (14)0.0537 (16)0.0537 (16)−0.0016 (12)0.0206 (12)−0.0004 (13)
C120.0395 (13)0.0406 (14)0.0444 (14)−0.0046 (11)0.0130 (11)0.0014 (11)
C130.0370 (13)0.0393 (13)0.0376 (13)−0.0032 (11)0.0083 (10)0.0000 (11)
C140.078 (2)0.0404 (15)0.068 (2)0.0007 (14)0.0221 (16)0.0101 (14)
C150.0470 (16)0.078 (2)0.0665 (19)−0.0225 (15)0.0166 (14)−0.0063 (16)
C160.0373 (12)0.0299 (12)0.0276 (11)0.0019 (10)0.0078 (9)−0.0025 (9)
C170.0331 (12)0.0281 (11)0.0320 (12)0.0007 (9)0.0071 (10)−0.0003 (10)
C180.0306 (11)0.0278 (11)0.0335 (12)0.0014 (9)0.0065 (9)0.0018 (10)
C190.0423 (13)0.0375 (13)0.0369 (13)−0.0016 (11)0.0118 (11)0.0041 (11)
C200.0435 (14)0.0367 (13)0.0441 (14)−0.0068 (11)0.0163 (11)0.0004 (11)
C210.0626 (17)0.0347 (13)0.0523 (16)−0.0116 (12)0.0228 (13)−0.0058 (12)
C220.0352 (12)0.0318 (12)0.0390 (14)0.0019 (10)0.0071 (10)−0.0030 (11)
C230.0392 (14)0.0672 (19)0.0686 (19)0.0025 (13)0.0164 (13)0.0030 (16)
C240.0667 (18)0.0572 (17)0.0613 (19)−0.0174 (14)0.0277 (15)0.0053 (14)
C250.0310 (12)0.0289 (12)0.0328 (12)−0.0031 (9)0.0035 (10)−0.0020 (10)
C260.0447 (14)0.0349 (13)0.0344 (13)0.0041 (11)0.0110 (11)0.0050 (10)
C270.0467 (14)0.0387 (14)0.0445 (15)0.0076 (11)0.0188 (12)0.0031 (12)
C280.0379 (13)0.0298 (12)0.0425 (14)0.0028 (10)0.0055 (11)0.0017 (11)
C290.0429 (13)0.0327 (12)0.0309 (12)−0.0008 (10)0.0078 (10)0.0066 (10)
C300.0413 (13)0.0328 (12)0.0336 (13)−0.0001 (10)0.0106 (10)−0.0014 (10)
C310.117 (3)0.072 (2)0.0530 (18)0.0312 (19)0.0444 (19)0.0244 (16)
N10.0347 (10)0.0340 (10)0.0270 (10)−0.0035 (8)0.0078 (8)−0.0013 (8)
O10.0639 (12)0.0427 (10)0.0406 (10)−0.0104 (8)0.0084 (8)−0.0098 (8)
O20.0616 (12)0.0802 (14)0.0377 (10)−0.0048 (10)0.0213 (9)−0.0042 (10)
O30.0598 (12)0.0433 (10)0.0583 (12)0.0200 (9)0.0205 (10)0.0155 (9)
O40.0753 (13)0.0514 (11)0.0431 (10)0.0193 (9)0.0236 (9)0.0164 (9)
C1—C21.383 (3)C16—H160.9800
C1—C61.392 (3)C17—C181.367 (3)
C1—H10.9300C17—C221.459 (3)
C2—C31.371 (4)C18—N11.400 (3)
C2—H20.9300C18—C191.513 (3)
C3—C41.370 (5)C19—C201.535 (3)
C3—H30.9300C19—H19A0.9700
C4—C51.392 (4)C19—H19B0.9700
C4—H40.9300C20—C211.528 (3)
C5—C61.384 (3)C20—C241.531 (3)
C5—H50.9300C20—C231.538 (3)
C6—C71.511 (3)C21—C221.512 (3)
C7—N11.487 (3)C21—H21A0.9700
C7—H7A0.9700C21—H21B0.9700
C7—H7B0.9700C22—O11.240 (3)
C8—C91.365 (3)C23—H23A0.9600
C8—N11.404 (3)C23—H23B0.9600
C8—C131.511 (3)C23—H23C0.9600
C9—C101.462 (3)C24—H24A0.9600
C9—C161.522 (3)C24—H24B0.9600
C10—O21.236 (3)C24—H24C0.9600
C10—C111.514 (3)C25—C261.387 (3)
C11—C121.532 (3)C25—C301.407 (3)
C11—H11A0.9700C26—C271.393 (3)
C11—H11B0.9700C26—H260.9300
C12—C141.534 (3)C27—C281.380 (3)
C12—C131.535 (3)C27—H270.9300
C12—C151.537 (3)C28—O31.376 (3)
C13—H13A0.9700C28—C291.396 (3)
C13—H13B0.9700C29—O41.383 (3)
C14—H14A0.9600C29—C301.393 (3)
C14—H14B0.9600C30—H300.9300
C14—H14C0.9600C31—O41.415 (3)
C15—H15A0.9600C31—H31A0.9600
C15—H15B0.9600C31—H31B0.9600
C15—H15C0.9600C31—H31C0.9600
C16—C171.512 (3)O3—H3A0.94 (4)
C16—C251.541 (3)
C2—C1—C6121.2 (3)C18—C17—C22119.6 (2)
C2—C1—H1119.4C18—C17—C16120.02 (19)
C6—C1—H1119.4C22—C17—C16120.38 (19)
C3—C2—C1119.9 (3)C17—C18—N1119.9 (2)
C3—C2—H2120.1C17—C18—C19122.82 (19)
C1—C2—H2120.1N1—C18—C19117.30 (18)
C4—C3—C2120.2 (3)C18—C19—C20114.28 (18)
C4—C3—H3119.9C18—C19—H19A108.7
C2—C3—H3119.9C20—C19—H19A108.7
C3—C4—C5120.1 (3)C18—C19—H19B108.7
C3—C4—H4119.9C20—C19—H19B108.7
C5—C4—H4119.9H19A—C19—H19B107.6
C6—C5—C4120.7 (3)C21—C20—C24109.8 (2)
C6—C5—H5119.7C21—C20—C19107.77 (19)
C4—C5—H5119.7C24—C20—C19108.7 (2)
C5—C6—C1118.0 (2)C21—C20—C23110.8 (2)
C5—C6—C7121.1 (2)C24—C20—C23108.9 (2)
C1—C6—C7120.9 (2)C19—C20—C23110.8 (2)
N1—C7—C6111.90 (18)C22—C21—C20113.29 (19)
N1—C7—H7A109.2C22—C21—H21A108.9
C6—C7—H7A109.2C20—C21—H21A108.9
N1—C7—H7B109.2C22—C21—H21B108.9
C6—C7—H7B109.2C20—C21—H21B108.9
H7A—C7—H7B107.9H21A—C21—H21B107.7
C9—C8—N1120.03 (19)O1—C22—C17122.0 (2)
C9—C8—C13122.3 (2)O1—C22—C21120.7 (2)
N1—C8—C13117.57 (19)C17—C22—C21117.3 (2)
C8—C9—C10120.8 (2)C20—C23—H23A109.5
C8—C9—C16119.9 (2)C20—C23—H23B109.5
C10—C9—C16119.26 (19)H23A—C23—H23B109.5
O2—C10—C9121.7 (2)C20—C23—H23C109.5
O2—C10—C11121.1 (2)H23A—C23—H23C109.5
C9—C10—C11117.2 (2)H23B—C23—H23C109.5
C10—C11—C12111.8 (2)C20—C24—H24A109.5
C10—C11—H11A109.2C20—C24—H24B109.5
C12—C11—H11A109.2H24A—C24—H24B109.5
C10—C11—H11B109.2C20—C24—H24C109.5
C12—C11—H11B109.2H24A—C24—H24C109.5
H11A—C11—H11B107.9H24B—C24—H24C109.5
C11—C12—C14109.2 (2)C26—C25—C30118.0 (2)
C11—C12—C13109.12 (19)C26—C25—C16122.2 (2)
C14—C12—C13110.0 (2)C30—C25—C16119.8 (2)
C11—C12—C15111.2 (2)C25—C26—C27121.1 (2)
C14—C12—C15109.2 (2)C25—C26—H26119.5
C13—C12—C15108.1 (2)C27—C26—H26119.5
C8—C13—C12114.50 (19)C28—C27—C26120.9 (2)
C8—C13—H13A108.6C28—C27—H27119.6
C12—C13—H13A108.6C26—C27—H27119.6
C8—C13—H13B108.6O3—C28—C27118.0 (2)
C12—C13—H13B108.6O3—C28—C29123.1 (2)
H13A—C13—H13B107.6C27—C28—C29119.0 (2)
C12—C14—H14A109.5O4—C29—C30125.5 (2)
C12—C14—H14B109.5O4—C29—C28114.2 (2)
H14A—C14—H14B109.5C30—C29—C28120.3 (2)
C12—C14—H14C109.5C29—C30—C25120.8 (2)
H14A—C14—H14C109.5C29—C30—H30119.6
H14B—C14—H14C109.5C25—C30—H30119.6
C12—C15—H15A109.5O4—C31—H31A109.5
C12—C15—H15B109.5O4—C31—H31B109.5
H15A—C15—H15B109.5H31A—C31—H31B109.5
C12—C15—H15C109.5O4—C31—H31C109.5
H15A—C15—H15C109.5H31A—C31—H31C109.5
H15B—C15—H15C109.5H31B—C31—H31C109.5
C17—C16—C9106.92 (17)C18—N1—C8119.06 (18)
C17—C16—C25113.24 (18)C18—N1—C7119.81 (18)
C9—C16—C25111.08 (17)C8—N1—C7121.08 (17)
C17—C16—H16108.5C28—O3—H3A112 (2)
C9—C16—H16108.5C29—O4—C31117.53 (19)
C25—C16—H16108.5
C6—C1—C2—C3−0.1 (4)C18—C19—C20—C21−44.2 (3)
C1—C2—C3—C4−0.1 (5)C18—C19—C20—C24−163.2 (2)
C2—C3—C4—C50.5 (5)C18—C19—C20—C2377.2 (3)
C3—C4—C5—C6−0.7 (5)C24—C20—C21—C22174.9 (2)
C4—C5—C6—C10.4 (4)C19—C20—C21—C2256.6 (3)
C4—C5—C6—C7−178.9 (2)C23—C20—C21—C22−64.8 (3)
C2—C1—C6—C5−0.1 (4)C18—C17—C22—O1175.6 (2)
C2—C1—C6—C7179.3 (2)C16—C17—C22—O1−3.1 (3)
C5—C6—C7—N1−129.5 (2)C18—C17—C22—C21−2.0 (3)
C1—C6—C7—N151.1 (3)C16—C17—C22—C21179.3 (2)
N1—C8—C9—C10168.45 (19)C20—C21—C22—O1147.2 (2)
C13—C8—C9—C10−8.8 (3)C20—C21—C22—C17−35.1 (3)
N1—C8—C9—C16−11.7 (3)C17—C16—C25—C26−26.1 (3)
C13—C8—C9—C16171.10 (19)C9—C16—C25—C2694.3 (2)
C8—C9—C10—O2176.0 (2)C17—C16—C25—C30155.81 (19)
C16—C9—C10—O2−3.9 (3)C9—C16—C25—C30−83.9 (2)
C8—C9—C10—C11−5.3 (3)C30—C25—C26—C270.5 (3)
C16—C9—C10—C11174.81 (19)C16—C25—C26—C27−177.6 (2)
O2—C10—C11—C12−142.6 (2)C25—C26—C27—C28−0.9 (3)
C9—C10—C11—C1238.8 (3)C26—C27—C28—O3−179.3 (2)
C10—C11—C12—C1463.9 (3)C26—C27—C28—C29−0.3 (3)
C10—C11—C12—C13−56.4 (3)O3—C28—C29—O40.5 (3)
C10—C11—C12—C15−175.5 (2)C27—C28—C29—O4−178.5 (2)
C9—C8—C13—C12−11.7 (3)O3—C28—C29—C30−179.2 (2)
N1—C8—C13—C12171.05 (19)C27—C28—C29—C301.8 (3)
C11—C12—C13—C843.4 (3)O4—C29—C30—C25178.1 (2)
C14—C12—C13—C8−76.5 (3)C28—C29—C30—C25−2.2 (3)
C15—C12—C13—C8164.4 (2)C26—C25—C30—C291.0 (3)
C8—C9—C16—C1736.7 (3)C16—C25—C30—C29179.24 (19)
C10—C9—C16—C17−143.48 (19)C17—C18—N1—C815.0 (3)
C8—C9—C16—C25−87.3 (2)C19—C18—N1—C8−163.75 (19)
C10—C9—C16—C2592.5 (2)C17—C18—N1—C7−167.41 (19)
C9—C16—C17—C18−38.3 (3)C19—C18—N1—C713.8 (3)
C25—C16—C17—C1884.3 (2)C9—C8—N1—C18−16.6 (3)
C9—C16—C17—C22140.35 (19)C13—C8—N1—C18160.74 (18)
C25—C16—C17—C22−97.0 (2)C9—C8—N1—C7165.86 (19)
C22—C17—C18—N1−163.77 (18)C13—C8—N1—C7−16.8 (3)
C16—C17—C18—N114.9 (3)C6—C7—N1—C1884.6 (2)
C22—C17—C18—C1914.9 (3)C6—C7—N1—C8−97.9 (2)
C16—C17—C18—C19−166.38 (19)C30—C29—O4—C31−2.1 (4)
C17—C18—C19—C2010.0 (3)C28—C29—O4—C31178.3 (2)
N1—C18—C19—C20−171.28 (19)
D—H···AD—HH···AD···AD—H···A
O3—H3A···O1i0.94 (4)2.07 (4)2.780 (2)131 (3)
C7—H7B···O1ii0.972.413.260 (3)146
  20 in total

1.  Search of antitubercular activities in tetrahydroacridines: synthesis and biological evaluation.

Authors:  R P Tripathi; S S Verma; Jyoti Pandey; K C Agarwal; Vinita Chaturvedi; Y K Manju; A K Srivastva; A Gaikwad; S Sinha
Journal:  Bioorg Med Chem Lett       Date:  2006-07-25       Impact factor: 2.823

2.  Acridine derivatives as anti-BVDV agents.

Authors:  Michele Tonelli; Gerolamo Vettoretti; Bruno Tasso; Federica Novelli; Vito Boido; Fabio Sparatore; Bernardetta Busonera; Aicha Ouhtit; Pamela Farci; Sylvain Blois; Gabriele Giliberti; Paolo La Colla
Journal:  Antiviral Res       Date:  2011-05-14       Impact factor: 5.970

3.  Synthesis of new chalcone derivatives containing acridinyl moiety with potential antimalarial activity.

Authors:  V Tomar; G Bhattacharjee; S Rajakumar; Kumkum Srivastava; S K Puri
Journal:  Eur J Med Chem       Date:  2009-11-20       Impact factor: 6.514

4.  Synthesis and antileishmanial activities of 4,5-di-substituted acridines as compared to their 4-mono-substituted homologues.

Authors:  Di Giorgio Carole; De Méo Michel; Chiron Julien; Delmas Florence; Nikoyan Anna; Jean Séverine; Dumenil Gérard; Timon-David Pierre; Galy Jean-Pierre
Journal:  Bioorg Med Chem       Date:  2005-10-01       Impact factor: 3.641

5.  Crystal structure and Hirshfeld surface analysis of ethyl 2-[9-(2-hy-droxy-phen-yl)-3,3,6,6-tetra-methyl-1,8-dioxo-2,3,4,4a,5,6,7,8a,9,9a,10,10a-dodeca-hydro-acridin-10-yl]acetate.

Authors:  Omyma A A Abd Allah; Manpreet Kaur; Mehmet Akkurt; Shaaban K Mohamed; Jerry P Jasinski; Sahar M I Elgarhy
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2021-02-12

6.  Screening of unsubstituted cyclic compounds as inhibitors of monoamine oxidases.

Authors:  U Thull; B Testa
Journal:  Biochem Pharmacol       Date:  1994-06-15       Impact factor: 5.858

7.  Synthesis and antitubercular activity of 6-chloro (unsubstituted)- 2-methoxy-9-substituted acridine derivatives.

Authors:  Enayat I Aly; Ashraf H Abadi
Journal:  Arch Pharm Res       Date:  2004-07       Impact factor: 4.946

8.  Crystal structure refinement with SHELXL.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr C Struct Chem       Date:  2015-01-01       Impact factor: 1.172

9.  10-Benzyl-9-(4-eth-oxy-phen-yl)-3,3,6,6-tetra-methyl-3,4,6,7,9,10-hexa-hydro-acridine-1,8(2H,5H)-dione.

Authors:  V Sughanya; N Sureshbabu
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-08-23

10.  Crystal structure, Hirshfeld surface and frontier mol-ecular orbital analysis of 10-benzyl-9-(3-eth-oxy-4-hy-droxy-phen-yl)-3,3,6,6-tetra-methyl-3,4,6,7,9,10-hexa-hydro-acridine-1,8(2H,5H)-dione.

Authors:  N Suresh Babu; V Sughanya; A Dhandapani; R Kalaivanan
Journal:  Acta Crystallogr E Crystallogr Commun       Date:  2020-03-27
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