Literature DB >> 21588973

10-Methyl-9-[2-(propan-2-yl)phenoxy-carbonyl]-acridinium trifluoro-methane-sulfonate.

Damian Trzybiński1, Karol Krzymiński, Jerzy Błażejowski.   

Abstract

In the crystal of the title compound, C(24)H(22)NO(2) (+)·CF(3)SO(3) (-), adjacent cations and anions are connected through C-H⋯O, C-H⋯F and S-O⋯π inter-actions, while neighboring cations via π-π inter-actions [centroid-centroid distance = 3.962 (2) Å]. The acridine and benzene ring systems are oriented at a dihedral angle of 14.6 (1)°. The carboxyl group is twisted at an angle of 87.6 (1)° relative to the acridine skeleton. The mean planes of adjacent acridine units are parallel or inclined at an angle of 13.4 (1)° in the crystal structure.

Entities:  

Year:  2010        PMID: 21588973      PMCID: PMC3009101          DOI: 10.1107/S160053681003953X

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For background to the chemiluminogenic properties of 9-phen­oxy­carbonyl-10-methyl­acridinium trifluoro­meth­ane­sulfonates, see: Natrajan et al. (2010 ▶); Brown et al. (2009 ▶); King et al. (2007 ▶); Rak et al. (1999 ▶); Roda et al. (2003 ▶); Zomer & Jacquemijns (2001 ▶). For related structures, see: Sikorski et al. (2006 ▶, 2007 ▶); Trzybiński et al. (2010 ▶). For inter­molecular inter­actions, see: Bianchi et al. (2004 ▶); Dorn et al. (2005 ▶); Hunter et al. (2001 ▶); Lyssenko & Anti­pin (2004 ▶); Novoa et al. (2006 ▶). For the synthesis, see: Sato (1996 ▶); Trzybiński et al. (2010 ▶).

Experimental

Crystal data

C24H22NO2CF3SO3 M = 505.51 Monoclinic, a = 14.4346 (7) Å b = 12.9677 (5) Å c = 13.0862 (5) Å β = 107.160 (5)° V = 2340.47 (17) Å3 Z = 4 Mo Kα radiation μ = 0.20 mm−1 T = 295 K 0.32 × 0.20 × 0.05 mm

Data collection

Oxford Diffraction Gemini R Ultra Ruby CCD diffractometer Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008 ▶) T min = 0.955, T max = 1.000 17556 measured reflections 4169 independent reflections 2436 reflections with I > 2σ(I) R int = 0.043

Refinement

R[F 2 > 2σ(F 2)] = 0.045 wR(F 2) = 0.116 S = 0.93 4169 reflections 319 parameters H-atom parameters constrained Δρmax = 0.34 e Å−3 Δρmin = −0.26 e Å−3 Data collection: CrysAlis CCD (Oxford Diffraction, 2008 ▶); cell refinement: CrysAlis RED (Oxford Diffraction, 2008 ▶); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009 ▶). Crystal structure: contains datablocks global, I. DOI: 10.1107/S160053681003953X/ng5040sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S160053681003953X/ng5040Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C24H22NO2+·CF3SO3F(000) = 1048
Mr = 505.51Dx = 1.435 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 5919 reflections
a = 14.4346 (7) Åθ = 3.0–29.2°
b = 12.9677 (5) ŵ = 0.20 mm1
c = 13.0862 (5) ÅT = 295 K
β = 107.160 (5)°Prism, yellow
V = 2340.47 (17) Å30.32 × 0.20 × 0.05 mm
Z = 4
Oxford Diffraction Gemini R Ultra Ruby CCD diffractometer4169 independent reflections
Radiation source: Enhanced (Mo) X-ray Source2436 reflections with I > 2σ(I)
graphiteRint = 0.043
Detector resolution: 10.4002 pixels mm-1θmax = 25.1°, θmin = 3.0°
ω scansh = −17→15
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008)k = −15→15
Tmin = 0.955, Tmax = 1.000l = −15→14
17556 measured reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.045Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.116H-atom parameters constrained
S = 0.93w = 1/[σ2(Fo2) + (0.0687P)2] where P = (Fo2 + 2Fc2)/3
4169 reflections(Δ/σ)max = 0.002
319 parametersΔρmax = 0.34 e Å3
0 restraintsΔρmin = −0.25 e Å3
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
C10.79663 (19)0.93471 (19)0.23882 (19)0.0538 (6)
H10.75850.96530.27660.065*
C20.83868 (19)0.9943 (2)0.1808 (2)0.0597 (7)
H20.82951.06530.17830.072*
C30.89659 (19)0.9483 (2)0.12396 (19)0.0611 (7)
H30.92500.98990.08360.073*
C40.91234 (18)0.8453 (2)0.12618 (18)0.0543 (7)
H40.95160.81730.08830.065*
C50.85827 (19)0.50582 (19)0.25407 (18)0.0529 (6)
H50.89670.47610.21620.064*
C60.8169 (2)0.4459 (2)0.3131 (2)0.0630 (7)
H60.82700.37500.31460.076*
C70.7591 (2)0.4880 (2)0.3722 (2)0.0615 (7)
H70.73190.44520.41270.074*
C80.74323 (19)0.58985 (19)0.37013 (18)0.0511 (6)
H80.70520.61730.40980.061*
C90.76717 (16)0.76264 (17)0.30277 (17)0.0416 (6)
N100.88297 (13)0.67612 (15)0.18987 (14)0.0445 (5)
C110.80948 (17)0.82595 (17)0.24349 (17)0.0429 (6)
C120.86933 (16)0.78034 (18)0.18595 (17)0.0429 (6)
C130.78353 (16)0.65678 (17)0.30837 (16)0.0415 (6)
C140.84322 (17)0.61298 (17)0.24995 (17)0.0433 (6)
C150.70287 (18)0.80997 (17)0.3623 (2)0.0450 (6)
O160.61194 (12)0.81571 (14)0.29809 (12)0.0569 (5)
O170.72938 (13)0.83794 (15)0.45268 (14)0.0667 (5)
C180.54272 (18)0.8721 (2)0.33483 (17)0.0516 (6)
C190.48032 (18)0.8207 (2)0.37892 (18)0.0529 (7)
C200.4108 (2)0.8824 (2)0.4042 (2)0.0648 (8)
H200.36660.85140.43380.078*
C210.4053 (2)0.9861 (3)0.3872 (2)0.0688 (8)
H210.35821.02450.40570.083*
C220.4685 (2)1.0341 (2)0.3430 (2)0.0718 (8)
H220.46481.10490.33130.086*
C230.5384 (2)0.9758 (2)0.3157 (2)0.0652 (8)
H230.58171.00700.28490.078*
C240.4878 (2)0.7061 (2)0.4025 (2)0.0665 (8)
H240.52640.67550.35990.080*
C250.5415 (3)0.6867 (3)0.5193 (3)0.1123 (14)
H25A0.60380.71970.53700.168*
H25B0.55000.61380.53150.168*
H25C0.50470.71430.56320.168*
C260.3890 (3)0.6532 (3)0.3699 (3)0.1142 (14)
H26A0.35660.66720.29590.171*
H26B0.35060.67890.41300.171*
H26C0.39760.58010.38030.171*
C270.9445 (2)0.6310 (2)0.1287 (2)0.0645 (7)
H27A0.93420.66770.06250.097*
H27B0.92770.55970.11390.097*
H27C1.01140.63620.16980.097*
S280.91241 (5)0.22174 (5)0.57658 (5)0.0556 (2)
O290.94541 (16)0.30956 (14)0.53324 (15)0.0809 (6)
O300.87168 (17)0.23980 (15)0.66093 (15)0.0838 (7)
O310.97784 (15)0.13502 (16)0.59437 (16)0.0819 (6)
C320.8122 (2)0.1755 (2)0.4689 (2)0.0603 (7)
F330.73755 (14)0.24221 (15)0.44537 (15)0.0955 (6)
F340.77668 (13)0.08743 (12)0.49175 (13)0.0840 (5)
F350.83430 (13)0.16316 (15)0.37865 (11)0.0895 (6)
U11U22U33U12U13U23
C10.0500 (17)0.0489 (16)0.0643 (15)0.0028 (13)0.0195 (14)−0.0015 (12)
C20.0544 (18)0.0509 (16)0.0716 (17)−0.0002 (13)0.0151 (15)0.0075 (14)
C30.0533 (19)0.069 (2)0.0583 (16)−0.0096 (14)0.0130 (14)0.0150 (14)
C40.0429 (16)0.0720 (19)0.0499 (14)−0.0010 (13)0.0166 (12)0.0044 (13)
C50.0505 (17)0.0518 (16)0.0532 (14)0.0114 (13)0.0101 (13)−0.0025 (12)
C60.073 (2)0.0457 (16)0.0642 (16)0.0109 (14)0.0110 (15)0.0028 (13)
C70.073 (2)0.0538 (17)0.0577 (15)0.0001 (15)0.0192 (15)0.0078 (13)
C80.0516 (17)0.0532 (16)0.0500 (13)0.0041 (12)0.0175 (12)0.0016 (12)
C90.0353 (15)0.0456 (14)0.0421 (12)0.0012 (11)0.0088 (11)−0.0043 (10)
N100.0327 (12)0.0512 (13)0.0496 (11)0.0048 (9)0.0122 (10)−0.0056 (9)
C110.0354 (14)0.0459 (14)0.0451 (12)−0.0009 (11)0.0079 (11)−0.0033 (10)
C120.0313 (14)0.0520 (16)0.0419 (12)0.0005 (11)0.0057 (11)−0.0020 (11)
C130.0350 (14)0.0469 (14)0.0400 (12)0.0022 (11)0.0072 (11)−0.0027 (10)
C140.0352 (15)0.0474 (15)0.0433 (12)0.0038 (11)0.0053 (11)−0.0011 (10)
C150.0448 (17)0.0431 (14)0.0491 (14)0.0012 (11)0.0168 (13)−0.0002 (11)
O160.0371 (11)0.0851 (13)0.0496 (9)0.0067 (9)0.0144 (9)−0.0141 (8)
O170.0565 (12)0.0881 (14)0.0508 (10)0.0133 (10)0.0083 (9)−0.0208 (9)
C180.0415 (16)0.0713 (18)0.0416 (13)0.0115 (13)0.0117 (12)−0.0051 (12)
C190.0424 (16)0.0733 (18)0.0438 (13)0.0045 (13)0.0141 (12)−0.0088 (12)
C200.0462 (19)0.088 (2)0.0656 (16)0.0073 (16)0.0254 (14)−0.0050 (15)
C210.053 (2)0.092 (2)0.0599 (17)0.0258 (17)0.0146 (15)−0.0015 (16)
C220.073 (2)0.075 (2)0.0639 (17)0.0230 (17)0.0137 (16)0.0102 (14)
C230.062 (2)0.081 (2)0.0571 (16)0.0124 (16)0.0234 (15)0.0095 (14)
C240.062 (2)0.0676 (19)0.0780 (19)−0.0062 (15)0.0340 (16)−0.0155 (15)
C250.169 (4)0.072 (2)0.092 (2)−0.007 (2)0.032 (3)0.0148 (18)
C260.084 (3)0.097 (3)0.177 (4)−0.025 (2)0.062 (3)−0.056 (3)
C270.0563 (19)0.0703 (18)0.0781 (17)0.0122 (14)0.0374 (15)−0.0050 (14)
S280.0708 (5)0.0511 (4)0.0508 (4)−0.0092 (4)0.0269 (3)−0.0037 (3)
O290.1012 (17)0.0671 (12)0.0837 (13)−0.0311 (11)0.0416 (13)0.0000 (10)
O300.128 (2)0.0756 (13)0.0675 (11)−0.0128 (12)0.0596 (13)−0.0138 (9)
O310.0703 (15)0.0821 (14)0.0873 (13)0.0193 (12)0.0142 (11)0.0035 (11)
C320.061 (2)0.0637 (18)0.0655 (17)0.0012 (15)0.0326 (16)0.0020 (13)
F330.0703 (13)0.1043 (14)0.1154 (14)0.0249 (11)0.0328 (11)0.0228 (11)
F340.0793 (13)0.0644 (11)0.1129 (13)−0.0209 (9)0.0354 (11)−0.0061 (9)
F350.0815 (13)0.1338 (16)0.0590 (9)−0.0108 (11)0.0300 (9)−0.0252 (9)
C1—C21.347 (3)C18—C191.377 (3)
C1—C111.422 (3)C19—C201.397 (3)
C1—H10.9300C19—C241.515 (4)
C2—C31.405 (3)C20—C211.362 (4)
C2—H20.9300C20—H200.9300
C3—C41.354 (4)C21—C221.365 (4)
C3—H30.9300C21—H210.9300
C4—C121.412 (3)C22—C231.389 (4)
C4—H40.9300C22—H220.9300
C5—C61.353 (3)C23—H230.9300
C5—C141.405 (3)C24—C251.516 (4)
C5—H50.9300C24—C261.527 (4)
C6—C71.405 (4)C24—H240.9800
C6—H60.9300C25—H25A0.9600
C7—C81.340 (3)C25—H25B0.9600
C7—H70.9300C25—H25C0.9600
C8—C131.422 (3)C26—H26A0.9600
C8—H80.9300C26—H26B0.9600
C9—C111.389 (3)C26—H26C0.9600
C9—C131.391 (3)C27—H27A0.9600
C9—C151.507 (3)C27—H27B0.9600
N10—C121.365 (3)C27—H27C0.9600
N10—C141.373 (3)S28—O301.4148 (17)
N10—C271.481 (3)S28—O291.4161 (18)
C11—C121.431 (3)S28—O311.443 (2)
C13—C141.428 (3)S28—C321.799 (3)
C15—O171.188 (3)C32—F351.321 (3)
C15—O161.335 (3)C32—F341.322 (3)
O16—C181.431 (3)C32—F331.344 (3)
C18—C231.366 (4)
C2—C1—C11121.2 (2)C18—C19—C24123.0 (2)
C2—C1—H1119.4C20—C19—C24121.8 (2)
C11—C1—H1119.4C21—C20—C19122.6 (3)
C1—C2—C3119.5 (2)C21—C20—H20118.7
C1—C2—H2120.2C19—C20—H20118.7
C3—C2—H2120.2C20—C21—C22120.3 (3)
C4—C3—C2122.0 (2)C20—C21—H21119.9
C4—C3—H3119.0C22—C21—H21119.9
C2—C3—H3119.0C21—C22—C23119.2 (3)
C3—C4—C12120.1 (2)C21—C22—H22120.4
C3—C4—H4119.9C23—C22—H22120.4
C12—C4—H4119.9C18—C23—C22119.0 (3)
C6—C5—C14120.1 (2)C18—C23—H23120.5
C6—C5—H5120.0C22—C23—H23120.5
C14—C5—H5120.0C19—C24—C25110.7 (2)
C5—C6—C7121.7 (2)C19—C24—C26112.3 (3)
C5—C6—H6119.2C25—C24—C26111.4 (3)
C7—C6—H6119.2C19—C24—H24107.4
C8—C7—C6119.9 (2)C25—C24—H24107.4
C8—C7—H7120.1C26—C24—H24107.4
C6—C7—H7120.1C24—C25—H25A109.5
C7—C8—C13121.1 (2)C24—C25—H25B109.5
C7—C8—H8119.4H25A—C25—H25B109.5
C13—C8—H8119.4C24—C25—H25C109.5
C11—C9—C13121.1 (2)H25A—C25—H25C109.5
C11—C9—C15119.2 (2)H25B—C25—H25C109.5
C13—C9—C15119.70 (19)C24—C26—H26A109.5
C12—N10—C14122.16 (18)C24—C26—H26B109.5
C12—N10—C27118.31 (19)H26A—C26—H26B109.5
C14—N10—C27119.5 (2)C24—C26—H26C109.5
C9—C11—C1122.5 (2)H26A—C26—H26C109.5
C9—C11—C12118.9 (2)H26B—C26—H26C109.5
C1—C11—C12118.6 (2)N10—C27—H27A109.5
N10—C12—C4122.0 (2)N10—C27—H27B109.5
N10—C12—C11119.5 (2)H27A—C27—H27B109.5
C4—C12—C11118.5 (2)N10—C27—H27C109.5
C9—C13—C8122.7 (2)H27A—C27—H27C109.5
C9—C13—C14119.0 (2)H27B—C27—H27C109.5
C8—C13—C14118.3 (2)O30—S28—O29116.47 (12)
N10—C14—C5121.7 (2)O30—S28—O31113.97 (13)
N10—C14—C13119.3 (2)O29—S28—O31114.20 (13)
C5—C14—C13118.9 (2)O30—S28—C32104.08 (13)
O17—C15—O16125.3 (2)O29—S28—C32104.00 (12)
O17—C15—C9124.9 (2)O31—S28—C32101.75 (13)
O16—C15—C9109.79 (19)F35—C32—F34108.1 (2)
C15—O16—C18118.12 (17)F35—C32—F33105.2 (2)
C23—C18—C19123.6 (2)F34—C32—F33105.7 (2)
C23—C18—O16116.1 (2)F35—C32—S28112.96 (19)
C19—C18—O16120.1 (2)F34—C32—S28112.72 (19)
C18—C19—C20115.2 (2)F33—C32—S28111.7 (2)
C11—C1—C2—C3−0.2 (4)C8—C13—C14—N10−179.9 (2)
C1—C2—C3—C4−0.5 (4)C9—C13—C14—C5−178.8 (2)
C2—C3—C4—C120.6 (4)C8—C13—C14—C51.2 (3)
C14—C5—C6—C7−0.6 (4)C11—C9—C15—O17−92.5 (3)
C5—C6—C7—C80.5 (4)C13—C9—C15—O1787.2 (3)
C6—C7—C8—C130.4 (4)C11—C9—C15—O1687.4 (2)
C13—C9—C11—C1−178.0 (2)C13—C9—C15—O16−92.8 (2)
C15—C9—C11—C11.7 (3)O17—C15—O16—C188.9 (3)
C13—C9—C11—C121.2 (3)C9—C15—O16—C18−171.01 (19)
C15—C9—C11—C12−179.1 (2)C15—O16—C18—C2386.1 (3)
C2—C1—C11—C9179.9 (2)C15—O16—C18—C19−98.8 (3)
C2—C1—C11—C120.7 (4)C23—C18—C19—C20−0.3 (4)
C14—N10—C12—C4178.4 (2)O16—C18—C19—C20−175.1 (2)
C27—N10—C12—C4−0.4 (3)C23—C18—C19—C24−178.2 (2)
C14—N10—C12—C11−1.9 (3)O16—C18—C19—C247.0 (4)
C27—N10—C12—C11179.4 (2)C18—C19—C20—C21−0.4 (4)
C3—C4—C12—N10179.7 (2)C24—C19—C20—C21177.5 (3)
C3—C4—C12—C11−0.1 (3)C19—C20—C21—C220.6 (4)
C9—C11—C12—N100.5 (3)C20—C21—C22—C230.0 (4)
C1—C11—C12—N10179.7 (2)C19—C18—C23—C220.8 (4)
C9—C11—C12—C4−179.8 (2)O16—C18—C23—C22175.8 (2)
C1—C11—C12—C4−0.6 (3)C21—C22—C23—C18−0.6 (4)
C11—C9—C13—C8178.6 (2)C18—C19—C24—C2597.9 (3)
C15—C9—C13—C8−1.2 (3)C20—C19—C24—C25−79.8 (3)
C11—C9—C13—C14−1.4 (3)C18—C19—C24—C26−137.0 (3)
C15—C9—C13—C14178.9 (2)C20—C19—C24—C2645.3 (3)
C7—C8—C13—C9178.8 (2)O30—S28—C32—F35174.13 (19)
C7—C8—C13—C14−1.2 (3)O29—S28—C32—F3551.7 (2)
C12—N10—C14—C5−179.5 (2)O31—S28—C32—F35−67.2 (2)
C27—N10—C14—C5−0.8 (3)O30—S28—C32—F34−63.0 (2)
C12—N10—C14—C131.6 (3)O29—S28—C32—F34174.54 (18)
C27—N10—C14—C13−179.6 (2)O31—S28—C32—F3455.6 (2)
C6—C5—C14—N10−179.2 (2)O30—S28—C32—F3355.7 (2)
C6—C5—C14—C13−0.3 (3)O29—S28—C32—F33−66.7 (2)
C9—C13—C14—N100.0 (3)O31—S28—C32—F33174.42 (17)
D—H···AD—HH···AD···AD—H···A
C4—H4···O29i0.932.483.363 (3)159
C27—H27C···F35i0.962.513.250 (4)134
XIJI···JX···JXI···J
S28O29Cg1ii3.703 (2)3.879 (2)86.3 (1)
S28O31Cg1ii3.528 (2)3.879 (2)92.9 (1)
S28O31Cg2ii3.208 (2)4.128 (2)120.3 (2)
IJCgI···CgJDihedral angleCgI_PerpCgI_Offset
33iii3.962 (2)03.340 (1)2.131 (1)
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C4—H4⋯O29i0.932.483.363 (3)159
C27—H27C⋯F35i0.962.513.250 (4)134

Symmetry code: (i) .

Table 2

S–O⋯π inter­actions (Å,°)

Cg2 is the centroids of the C1–C4/C11/C12 ring.

XIJIJXJXIJ
S28O31Cg2ii3.208 (2)4.128 (2)120.3 (2)

Symmetry code: (ii) .

  9 in total

1.  Analytical bioluminescence and chemiluminescence.

Authors:  Aldo Roda; Massimo Guarigli; Elisa Michelini; Mara Mirasoli; Patrizia Pasini
Journal:  Anal Chem       Date:  2003-11-01       Impact factor: 6.986

2.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

3.  Enhanced immunoassay sensitivity using chemiluminescent acridinium esters with increased light output.

Authors:  Anand Natrajan; David Sharpe; Jim Costello; Qingping Jiang
Journal:  Anal Biochem       Date:  2010-07-27       Impact factor: 3.365

4.  Toward an Understanding of the Chemiluminescence Accompanying the Reaction of 9-Carboxy-10-methylacridinium Phenyl Ester with Hydrogen Peroxide.

Authors:  Janusz Rak; Piotr Skurski; Jerzy Blazejowski
Journal:  J Org Chem       Date:  1999-04-30       Impact factor: 4.354

5.  Flow injection analysis of H2O2 in natural waters using acridinium ester chemiluminescence: method development and optimization using a kinetic model.

Authors:  D Whitney King; William J Cooper; Steven A Rusak; Barrie M Peake; James J Kiddle; Daniel W O'Sullivan; Megan L Melamed; Chris R Morgan; Stephen M Theberge
Journal:  Anal Chem       Date:  2007-04-25       Impact factor: 6.986

6.  Development and application of a novel acridinium ester for use as a chemiluminescent emitter in nucleic acid hybridisation assays using chemiluminescence quenching.

Authors:  Richard C Brown; Zhaoqiang Li; Andrew J Rutter; Xiaojing Mu; Owen H Weeks; Keith Smith; Ian Weeks
Journal:  Org Biomol Chem       Date:  2008-11-24       Impact factor: 3.876

7.  Experimental electron density study of the supramolecular aggregation between 4,4'-dipyridyl-N,N'-dioxide and 1,4-diiodotetrafluorobenzene at 90 K.

Authors:  Riccardo Bianchi; Alessandra Forni; Tullio Pilati
Journal:  Acta Crystallogr B       Date:  2004-09-15

8.  9-(2-Ethyl-phenoxy-carbon-yl)-10-methyl-acridinium trifluoro-methane-sulfonate.

Authors:  Damian Trzybiński; Karol Krzymiński; Artur Sikorski; Piotr Malecha; Jerzy Błażejowski
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-03-13

9.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  9 in total

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