Crystal structure of poly[(μ3-4-amino-1,2,5-oxa-diazole-3-hydroxamato)thallium(I)].

The title compound represents the thallium(I) salt of a substituted 1,2,5-oxa-diazole, [Tl(C3H3N4O3)] n , with amino- and hydroxamate groups in the 4- and 3- positions of the oxa-diazole ring, respectively. In the crystal, the deprotonated hydroxamate group represents an inter-mediate between the keto/enol tautomers and forms a five-membered chelate ring with the thallium(I) cation. The coordination sphere of the cation is augmented to a distorted disphenoid by two monodentately binding O atoms from two adjacent anions, leading to the formation of zigzag chains extending parallel to the b axis. The cohesion within the chains is supported by π-π stacking [centroid-centroid distance = 3.746 (3) Å] and inter-molecular N-H⋯N hydrogen bonds. © Safyanova et al. 2020.

Chemical context

Substituted oxa­diazo­les attract attention because of their wide range of applications in organic synthesis as useful inter­mediates (Romeo & Chiacchio, 2011 ▸; Zlotin et al., 2017 ▸) and for drug design (Giorgis et al., 2011 ▸; Pal et al., 2017 ▸; Stepanov et al., 2015 ▸). In addition, mol­ecules with the oxa­diazole moiety can be considered for the creation of energetic systems (Zhang et al., 2015 ▸) with high thermal stability and mechanical sensitivity. The variety of coordination modes typical for oxa­diazole-containing ligands result in the formation of multiple mono- and polynuclear complexes, as well as coord­ination polymers (Akhbari & Morsali, 2010 ▸). Complexes with oxa­diazole-based ligands have demonstrated significant biological activity as anti-cancer (Glomb et al., 2018 ▸), anti-inflammatory (Singh et al., 2013 ▸), anti-tuberculosis (De et al., 2019 ▸) and anti-malarial (Zareef et al., 2007 ▸) agents.

However, the standard synthetic procedures for oxa­diazole-containing scaffolds usually utilizes the dehydrative cyclization of bis-oximes, which is performed at high temperatures (Fershtat & Makhova, 2016 ▸; Romeo & Chiacchio, 2011 ▸) and often includes the introduction of different activating reagents (Shaposhnikov et al., 2003 ▸; Telvekar & Takale, 2013 ▸). A convenient procedure for the synthesis of substituted 4-amino-1,2,5-oxa­diazo­les based on the formation of bis-oximes in situ from the hydroxyl­amine and cyano-oximes was recently proposed (Neel & Zhao, 2018 ▸). The introduction of dehydrating agents allows a significant decrease in the temperature during reaction, gave the possibility to synthesize substituted 1,2,5-oxa­diazo­les with various side functional groups. In this regard, we have adapted the synthetic procedure for 1,2,5-oxa­diazole with amino- and hydroxamate groups in the 4- and 3- position of the 1,2,5-oxa­diazole ring, respectively, and report here the thallium(I) salt of this compound, 1, Tl(C3H3N4O3). The introduction of a hydroxamic group at the 1,2,5-oxa­diazole ring allows the consideration of potentially inter­esting ligand systems for the synthesis of various polynuclear complexes (Pavlishchuk et al., 2018 ▸; Lutter et al., 2018 ▸; Ostrowska et al., 2019 ▸; Gumienna-Kontecka et al., 2007 ▸).

Structural commentary

The asymmetric unit of 1 comprises one 4-amino-1,2,5-oxa­diazole-3 hydroxamate anion and a thallium(I) cation. The oxa­diazole ring C2/C3/N2/O3/N3 is almost planar with the largest deviation from the least-squares plane being 0.007 Å for C2. The C2=N2 and C3=N3 bond lengths [1.304 (14) and 1.329 (11) Å, respectively] are typical for C=N double bonds in substituted oxa­diazole cycles (Viterbo & Serafino, 1978 ▸), and the N2—O3 and N3—O3 bonds [1.365 (11) and 1.419 (11) Å, respectively] also fall in a range typical for 1,2,5-oxa­diazo­les (Fonari et al., 2003 ▸; Viterbo & Serafino, 1978 ▸). The substituent amino- and hydroxamate groups in the 4- and 3- positions, respectively, of the 1,2,5-oxa­diazole ring are nearly coplanar with the oxa­diazole ring, with a deviation of 0.071 Å for nitro­gen atom N4 of the amino group and a dihedral angle between the mean plane of the heterocycle and the hydroxamate group C1/O2/N1/O1 of 8.4 (4)°. The C3—N4 [1.360 (13) Å] and N1—O1 [1.412 (9) Å] bond lengths are typical for a non-coordinating amino group (Fonari et al., 2003 ▸; Viterbo & Serafino, 1978 ▸) and for a deprotonated hydroxamate group (Golenya et al., 2012 ▸; Safyanova et al., 2017 ▸), respectively. On the other hand, the C1—N1 [1.314 (12) Å] and C1—O2 [1.275 (11) Å] bond lengths are inter­mediate between the tautomeric keto and enol forms (Larsen, 1988 ▸), accompanied by a delocalization of the π electrons over the N1—C1—O2 backbone and a disorder of the corresponding hydrogen atom that could not be localized from difference-Fourier maps.

The Tl1 cation in 1 is bonded to the bidentate hydroxamate anion through oxygen atoms O1 [2.814 (7) Å] and O2 [2.537 (7) Å] in the form of a five-membered chelate ring. The coordination sphere of the Tl1 cation in 1 is augmented to four by two monodentately binding O2 atoms of two adjacent oxa­diazole moieties with distances of Tl1—O2ii = 2.880 (7) Å and Tl1—O2i = 2.761 (7) Å [symmetry codes: (i) −x, y + , −z + ; (ii) −x, y − , −z + ] (Fig. 1 ▸). The bond length Tl1—O2 is ca 0.2–0.3 Å shorter in the case of the chelating coordination mode of the hydroxamate group compared with the monodentate coordination mode. Thus, each O2 atom is involved in a chelate coordination with one Tl1 ion and in a monodentate coordination with two other Tl1 ions, forming zigzag chains extending along the b-axis direction (Fig. 2 ▸). The Tl—O bond lengths involving the hydroxamate oxygen atoms in 1 are typical for TlI compounds (Salassa & Terenzi, 2019 ▸), and the formation of similar polymeric chains is frequently observed for TlI complexes (Akhbari et al., 2009 ▸). The resulting coordination sphere of Tl1 can be best described as a distorted seesaw (SS-4) or disphenoid with a stereochemically active lone pair (Mudring & Rieger, 2005 ▸). If longer bonds are taken into account (Akhbari & Morsali, 2010 ▸; Schroffenegger et al., 2020 ▸), the Tl1 cation also has weak inter­actions at 3.453 (8), 3.289 (9), 3.385 (7) and 3.219 (8) Å with O3iv, N2ii, O1v and O3vi [symmetry codes: (iv) x, −y + , z + ; (v) x, y + 1, z; (vi) x, −y + , z + ] atoms from another three oxa­diazole moieties. The closest contact between adjacent Tl1 cations within a zigzag chain is 3.7458 (5) Å.

Figure 1

A fragment of the crystal structure of 1 showing the coordination environment of the Tl1 ions with displacement ellipsoids drawn at the 50% probability level. [Symmetry codes: (i) 1 + x, y, z; (ii) 1 − x,  + y,  − z; (iii) 1 + x, 1 + y, z; (iv) 1 − x, − + y,  − z; (v) 1 − x,  + y,  − z.]

Figure 2

The formation of polymeric zigzag chains in 1. [Symmetry codes: (i) 1 + x, y, z; (ii) 1 − x,  + y,  − z; (iii) 1 + x, 1 + y, z; (iv) 1 − x, − + y,  − z; (v) 1 − x,  + y,  − z.]

Supra­molecular features

In the crystal, the oxa­diazole rings are stacked in a parallel manner with a centroid–centroid distance = 3.746 (3) Å (Fig. 1 ▸). Together with weak inter­molecular hydrogen bonds between the amino group (N4) and two nitro­gen atoms from the azolo (N3) and the hydroxamic (N1) group (Table 1 ▸, Fig. 3 ▸) they support the cohesion of the chains along the b-axis direction.

Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯N3i	0.93	2.23	3.156 (10)	169
N4—H4B⋯N1ii	1.01	2.65	3.256 (13)	118

Symmetry codes: (i) ; (ii) .

Figure 3

Packing diagram of 1, with hydrogen bonds indicated by dashed lines.

Database survey

A search in the Cambridge Structural Database (CSD version 5.39, update of May 2018; Groom et al., 2016 ▸) for substituted oxa­diazo­les revealed two structures, viz. 3-amino-4-methyl­furazan (Pibiri et al., 2018 ▸) and 4-amino-1,2,5-oxa­diazole-3-carboxamide oxime (Zhang & Jian, 2009 ▸). TlI complexes with comparable organic ligands have been reported for thallium (anthrano­yl)anthranilate (Wiesbrock & Schmidbaur, 2004 ▸), thallium(I) 2-amino-benzoate (Wiesbrock & Schmidbaur, 2003 ▸), thallium(I) aryl­cyanoxime (Robertson et al., 2004 ▸) [Tl4(H2O)2(anthracene-9-carboxyl­ate)4] (Kumar et al., 2015 ▸), bis­[(μ-1,3-di­phenyl­propane-1,3-dionato-O,O′:O′)di­methylthallium] (Britton, 2001 ▸) and thallium(I) 4-hy­droxy­benzyl­idene-4-amino­benzoate (Akhbari et al., 2009 ▸).

Synthesis and crystallization

The title compound was obtained according to a modification of the procedure reported by Neel & Zhao (2018 ▸) (Fig. 4 ▸). Solutions containing 5 mmol of hydroxyl­amine hydro­chloride in 10 ml of methanol, and 10 mmol of sodium methoxide in 15 ml of methanol were stirred for 30 min while cooling in an ice bath. The formed precipitate of sodium chloride was filtered off. The methano­lic solutions of ethyl-2-cyano-2-(hy­droxy­imino)­acetate (5 mmol) and hydroxyl­amine were combined and stirred for 5 h at room temperature. The resulting white precipitate was filtered off and dissolved in 5 ml of water, followed by HCl addition to pH = 5. The organic compound was extracted with ethyl acetate; the extract was subsequently dried over anhydrous Na2SO4, and the solvent was finally removed by rotary evaporation. Colorless crystals of 1 suitable for single crystal X-ray analysis were obtained by combining the organic compound with thallium(I) nitrate in iso­propanol and subsequent slow evaporation of the solvent at ambient temperature within 48 h (yield 16.5%).

Figure 4

Synthesis scheme for 4-amino-1,2,5-oxa­diazole-3 hydroxamate thallium(I).

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. The H atoms of the amino group were located from a difference-Fourier map; their coordinates were refined freely with U iso(H) = 1.2U eq(N). The hydrogen atom of the hydroxamate function could not be observed in difference-Fourier maps, and a tentative calculated position was in too close vicinity to atom H4B of the amino group. Most probably, the hydroxamate H atom is disordered over the N1—C1—O2 backbone due to the presence of both tautomeric forms. Hence, this H atom is not included in the final model. The highest remaining electron density is located 0.88 Å from Tl1.

Table 2

Experimental details

Crystal data
Chemical formula	[Tl(C3H3N4O3)]
M r	347.46
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	298
a, b, c (Å)	10.0731 (4), 3.74576 (18), 16.9805 (6)
β (°)	95.808 (4)
V (Å3)	637.41 (5)
Z	4
Radiation type	Mo Kα
μ (mm−1)	25.30
Crystal size (mm)	0.2 × 0.2 × 0.2
Data collection
Diffractometer	Agilent Xcalibur Sapphire3 CCD
Absorption correction	Multi-scan (CrysAlis PRO; Agilent, 2012 ▸)
T min, T max	0.231, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	4634, 1452, 1320
R int	0.056
(sin θ/λ)max (Å−1)	0.650
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.045, 0.111, 1.07
No. of reflections	1452
No. of parameters	100
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	6.17, −2.23

Computer programs: CrysAlis PRO (Agilent, 2012 ▸), SHELXT (Sheldrick, 2015 ▸), olex2.refine (Bourhis et al., 2015 ▸) and OLEX2 (Dolomanov et al., 2009 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989020001577/wm5530sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989020001577/wm5530Isup2.hkl

CCDC reference: 1981874

Additional supporting information: crystallographic information; 3D view; checkCIF report

[Tl(C3H3N4O3)]	F(000) = 612
Mr = 347.46	Dx = 3.610 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
a = 10.0731 (4) Å	Cell parameters from 216 reflections
b = 3.74576 (18) Å	θ = 4.4–22.3°
c = 16.9805 (6) Å	µ = 25.30 mm−1
β = 95.808 (4)°	T = 298 K
V = 637.41 (5) Å3	Block, clear colourless
Z = 4	0.2 × 0.2 × 0.2 mm

Agilent Xcalibur Sapphire3 CCD diffractometer	1320 reflections with I > 2σ(I)
ω scans	Rint = 0.056
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2012)	θmax = 27.5°, θmin = 3.0°
Tmin = 0.231, Tmax = 1.000	h = −13→13
4634 measured reflections	k = −4→4
1452 independent reflections	l = −22→19

Refinement on F2	0 restraints
Least-squares matrix: full	Hydrogen site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.045	H-atom parameters constrained
wR(F2) = 0.111	w = 1/[σ2(Fo2) + (0.0629P)2] where P = (Fo2 + 2Fc2)/3
S = 1.07	(Δ/σ)max = 0.001
1452 reflections	Δρmax = 6.17 e Å−3
100 parameters	Δρmin = −2.23 e Å−3

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.

	x	y	z	Uiso*/Ueq
Tl1	0.05880 (4)	0.45183 (11)	0.86058 (2)	0.03141 (19)
O2	0.1164 (7)	0.4279 (17)	0.7187 (4)	0.0298 (15)
O1	0.2851 (8)	0.0779 (19)	0.8210 (4)	0.0339 (17)
O3	0.2375 (8)	0.4924 (18)	0.4946 (5)	0.0339 (17)
N2	0.1809 (10)	0.510 (2)	0.5642 (6)	0.0299 (19)
N1	0.3245 (8)	0.148 (2)	0.7450 (4)	0.0301 (17)
C1	0.2298 (9)	0.319 (2)	0.7013 (5)	0.0257 (18)
N4	0.4966 (9)	0.110 (2)	0.6207 (5)	0.0339 (19)
H4A	0.528766	−0.041040	0.583376	0.041*
H4B	0.482666	0.024160	0.675476	0.041*
N3	0.3648 (8)	0.328 (2)	0.5070 (4)	0.0332 (18)
C2	0.2653 (9)	0.367 (3)	0.6185 (5)	0.0267 (18)
C3	0.3828 (9)	0.254 (2)	0.5839 (5)	0.0243 (17)

	U11	U22	U33	U12	U13	U23
Tl1	0.0281 (3)	0.0419 (3)	0.0240 (3)	0.00530 (14)	0.00185 (18)	−0.00084 (13)
O2	0.019 (3)	0.047 (4)	0.024 (3)	0.002 (3)	0.004 (3)	−0.002 (3)
O1	0.026 (4)	0.053 (4)	0.023 (4)	0.001 (3)	0.004 (3)	0.006 (3)
O3	0.030 (4)	0.049 (4)	0.023 (4)	0.001 (3)	0.002 (3)	0.003 (3)
N2	0.028 (5)	0.040 (4)	0.022 (4)	0.004 (3)	0.003 (4)	0.003 (3)
N1	0.027 (4)	0.041 (4)	0.023 (4)	0.005 (4)	0.005 (3)	0.002 (3)
C1	0.032 (5)	0.024 (4)	0.022 (4)	−0.002 (4)	0.003 (4)	−0.004 (3)
N4	0.031 (5)	0.044 (5)	0.029 (4)	0.008 (4)	0.011 (4)	−0.001 (4)
N3	0.028 (4)	0.042 (5)	0.028 (4)	0.009 (4)	0.000 (3)	0.002 (4)
C2	0.020 (4)	0.029 (4)	0.030 (5)	−0.002 (4)	−0.001 (4)	−0.005 (4)
C3	0.023 (4)	0.030 (4)	0.020 (4)	−0.004 (3)	0.000 (3)	−0.006 (3)

Tl1—O2	2.537 (7)	O1—N1	1.412 (9)
Tl1—O2i	2.761 (7)	O3—N2	1.365 (11)
Tl1—O1	2.814 (7)	O3—N3	1.419 (11)
Tl1—O2ii	2.880 (7)	N2—C2	1.304 (14)
Tl1—O3iii	3.219 (8)	N1—C1	1.314 (12)
Tl1—N2ii	3.289 (9)	C1—C2	1.497 (11)
Tl1—C1i	3.291 (9)	N4—C3	1.360 (13)
Tl1—O1iv	3.385 (7)	N4—H4A	0.9324
Tl1—C1	3.387 (8)	N4—H4B	1.0077
Tl1—O3v	3.453 (8)	N3—C3	1.329 (11)
O2—C1	1.275 (11)	C2—C3	1.437 (11)
O2—Tl1—O2i	75.9 (2)	N1—O1—Tl1vi	124.6 (6)
O2—Tl1—O1	59.1 (2)	Tl1—O1—Tl1vi	73.70 (15)
O2i—Tl1—O1	134.3 (2)	N1—O1—Tl1ii	69.9 (5)
O2—Tl1—O2ii	73.8 (2)	Tl1—O1—Tl1ii	67.89 (16)
O2i—Tl1—O2ii	83.2 (2)	Tl1vi—O1—Tl1ii	64.47 (13)
O1—Tl1—O2ii	91.3 (2)	N2—O3—N3	110.1 (8)
O2—Tl1—O3iii	119.2 (2)	N2—O3—Tl1vii	112.7 (6)
O2i—Tl1—O3iii	164.3 (2)	N3—O3—Tl1vii	108.2 (5)
O1—Tl1—O3iii	60.21 (19)	N2—O3—Tl1viii	107.8 (5)
O2ii—Tl1—O3iii	104.50 (19)	N3—O3—Tl1viii	139.7 (5)
O2—Tl1—O1iv	67.2 (2)	Tl1vii—O3—Tl1viii	68.20 (17)
O2i—Tl1—O1iv	82.28 (19)	N2—O3—Tl1i	29.7 (5)
O1—Tl1—O1iv	73.70 (16)	N3—O3—Tl1i	137.7 (5)
O2ii—Tl1—O1iv	140.56 (18)	Tl1vii—O3—Tl1i	103.6 (2)
O3iii—Tl1—O1iv	99.15 (19)	Tl1viii—O3—Tl1i	78.16 (14)
O2—Tl1—O3v	119.6 (2)	N2—O3—Tl1ii	36.6 (5)
O2i—Tl1—O3v	101.3 (2)	N3—O3—Tl1ii	111.1 (5)
O1—Tl1—O3v	94.4 (2)	Tl1vii—O3—Tl1ii	78.51 (15)
O2ii—Tl1—O3v	166.55 (18)	Tl1viii—O3—Tl1ii	107.4 (2)
O3iii—Tl1—O3v	68.20 (17)	Tl1i—O3—Tl1ii	49.53 (8)
O1iv—Tl1—O3v	52.89 (17)	C2—N2—O3	107.0 (8)
Tl1—O2—Tl1ii	106.8 (2)	C1—N1—O1	110.6 (7)
C1—O2—Tl1i	129.1 (6)	O2—C1—N1	129.9 (8)
Tl1—O2—Tl1i	103.4 (2)	O2—C1—C2	118.9 (9)
Tl1ii—O2—Tl1i	83.2 (2)	N1—C1—C2	111.1 (7)
C1—O2—Tl1vi	91.8 (5)	C3—N4—H4A	105.2
Tl1—O2—Tl1vi	57.29 (13)	C3—N4—H4B	111.1
Tl1ii—O2—Tl1vi	67.75 (13)	H4A—N4—H4B	121.6
Tl1i—O2—Tl1vi	134.9 (2)	C3—N3—O3	105.6 (6)
C1—O2—Tl1iv	123.5 (6)	N2—C2—C3	109.7 (8)
Tl1—O2—Tl1iv	54.51 (12)	N2—C2—C1	120.8 (8)
Tl1ii—O2—Tl1iv	133.3 (2)	C3—C2—C1	129.3 (9)
Tl1i—O2—Tl1iv	64.69 (12)	N3—C3—N4	124.0 (7)
Tl1vi—O2—Tl1iv	111.80 (14)	N3—C3—C2	107.6 (8)
N1—O1—Tl1	115.8 (5)	N4—C3—C2	128.3 (8)
N3—O3—N2—C2	−0.1 (10)	Tl1vi—N1—C1—Tl1i	74.4 (19)
Tl1vii—O3—N2—C2	120.8 (7)	O1—N1—C1—Tl1vi	−38.2 (6)
Tl1viii—O3—N2—C2	−166.0 (6)	Tl1—N1—C1—Tl1vi	−48.4 (2)
Tl1i—O3—N2—C2	−161.9 (14)	Tl1ii—N1—C1—Tl1vi	29.4 (5)
Tl1ii—O3—N2—C2	98.6 (9)	N2—O3—N3—C3	−0.6 (10)
N3—O3—N2—Tl1i	161.8 (7)	Tl1vii—O3—N3—C3	−124.1 (6)
Tl1vii—O3—N2—Tl1i	−77.3 (8)	Tl1viii—O3—N3—C3	158.3 (6)
Tl1viii—O3—N2—Tl1i	−4.1 (10)	Tl1i—O3—N3—C3	12.7 (11)
Tl1ii—O3—N2—Tl1i	−99.5 (12)	Tl1ii—O3—N3—C3	−39.7 (8)
N3—O3—N2—Tl1ii	−98.7 (9)	N2—O3—N3—Tl1vii	123.5 (7)
Tl1vii—O3—N2—Tl1ii	22.2 (9)	Tl1viii—O3—N3—Tl1vii	−77.5 (7)
Tl1viii—O3—N2—Tl1ii	95.4 (6)	Tl1i—O3—N3—Tl1vii	136.8 (8)
Tl1i—O3—N2—Tl1ii	99.5 (12)	Tl1ii—O3—N3—Tl1vii	84.4 (3)
N3—O3—N2—Tl1vii	−120.9 (7)	N2—O3—N3—Tl1viii	−158.9 (12)
Tl1viii—O3—N2—Tl1vii	73.2 (4)	Tl1vii—O3—N3—Tl1viii	77.5 (7)
Tl1i—O3—N2—Tl1vii	77.3 (8)	Tl1i—O3—N3—Tl1viii	−145.6 (13)
Tl1ii—O3—N2—Tl1vii	−22.2 (9)	Tl1ii—O3—N3—Tl1viii	161.9 (10)
N3—O3—N2—Tl1viii	165.9 (8)	O3—N2—C2—C3	0.7 (11)
Tl1vii—O3—N2—Tl1viii	−73.2 (4)	Tl1i—N2—C2—C3	−166.4 (6)
Tl1i—O3—N2—Tl1viii	4.1 (10)	Tl1ii—N2—C2—C3	131.4 (7)
Tl1ii—O3—N2—Tl1viii	−95.4 (6)	Tl1vii—N2—C2—C3	52.0 (10)
Tl1—O1—N1—C1	−13.7 (9)	Tl1viii—N2—C2—C3	−29 (2)
Tl1vi—O1—N1—C1	73.8 (9)	O3—N2—C2—C1	−175.4 (8)
Tl1ii—O1—N1—C1	37.9 (6)	Tl1i—N2—C2—C1	17.5 (11)
Tl1vi—O1—N1—Tl1	87.4 (6)	Tl1ii—N2—C2—C1	−44.7 (8)
Tl1ii—O1—N1—Tl1	51.6 (4)	Tl1vii—N2—C2—C1	−124.2 (7)
Tl1—O1—N1—Tl1ii	−51.6 (4)	Tl1viii—N2—C2—C1	154.6 (11)
Tl1vi—O1—N1—Tl1ii	35.9 (5)	O3—N2—C2—Tl1ii	−130.7 (7)
Tl1—O1—N1—Tl1vi	−87.4 (6)	Tl1i—N2—C2—Tl1ii	62.2 (4)
Tl1ii—O1—N1—Tl1vi	−35.9 (5)	Tl1vii—N2—C2—Tl1ii	−79.4 (5)
Tl1—O2—C1—N1	13.2 (13)	Tl1viii—N2—C2—Tl1ii	−160.6 (16)
Tl1ii—O2—C1—N1	−106.2 (10)	O3—N2—C2—Tl1i	167.1 (9)
Tl1i—O2—C1—N1	162.0 (7)	Tl1ii—N2—C2—Tl1i	−62.2 (4)
Tl1vi—O2—C1—N1	−38.7 (10)	Tl1vii—N2—C2—Tl1i	−141.7 (8)
Tl1iv—O2—C1—N1	79.1 (11)	Tl1viii—N2—C2—Tl1i	137.1 (18)
Tl1—O2—C1—C2	−170.2 (6)	O2—C1—C2—N2	−1.5 (14)
Tl1ii—O2—C1—C2	70.4 (8)	N1—C1—C2—N2	175.7 (9)
Tl1i—O2—C1—C2	−21.4 (12)	Tl1ii—C1—C2—N2	48.9 (9)
Tl1vi—O2—C1—C2	137.9 (7)	Tl1—C1—C2—N2	−18 (2)
Tl1iv—O2—C1—C2	−104.3 (8)	Tl1i—C1—C2—N2	−13.9 (9)
Tl1—O2—C1—Tl1ii	119.5 (6)	Tl1vi—C1—C2—N2	95.3 (11)
Tl1i—O2—C1—Tl1ii	−91.7 (7)	O2—C1—C2—C3	−176.8 (9)
Tl1vi—O2—C1—Tl1ii	67.6 (2)	N1—C1—C2—C3	0.4 (14)
Tl1iv—O2—C1—Tl1ii	−174.7 (6)	Tl1ii—C1—C2—C3	−126.4 (9)
Tl1ii—O2—C1—Tl1	−119.5 (6)	Tl1—C1—C2—C3	166.8 (11)
Tl1i—O2—C1—Tl1	148.8 (10)	Tl1i—C1—C2—C3	170.8 (10)
Tl1vi—O2—C1—Tl1	−51.9 (4)	Tl1vi—C1—C2—C3	−80.0 (13)
Tl1iv—O2—C1—Tl1	65.8 (5)	O2—C1—C2—Tl1ii	−50.4 (7)
Tl1—O2—C1—Tl1i	−148.8 (10)	N1—C1—C2—Tl1ii	126.8 (8)
Tl1ii—O2—C1—Tl1i	91.7 (7)	Tl1—C1—C2—Tl1ii	−66.7 (14)
Tl1vi—O2—C1—Tl1i	159.3 (7)	Tl1i—C1—C2—Tl1ii	−62.78 (17)
Tl1iv—O2—C1—Tl1i	−82.9 (6)	Tl1vi—C1—C2—Tl1ii	46.4 (7)
Tl1—O2—C1—Tl1vi	51.9 (4)	O2—C1—C2—Tl1i	12.4 (7)
Tl1ii—O2—C1—Tl1vi	−67.6 (2)	N1—C1—C2—Tl1i	−170.4 (8)
Tl1i—O2—C1—Tl1vi	−159.3 (7)	Tl1ii—C1—C2—Tl1i	62.78 (17)
Tl1iv—O2—C1—Tl1vi	117.8 (5)	Tl1—C1—C2—Tl1i	−3.9 (14)
O1—N1—C1—O2	1.8 (14)	Tl1vi—C1—C2—Tl1i	109.2 (8)
Tl1—N1—C1—O2	−8.4 (9)	O3—N3—C3—N4	−176.4 (8)
Tl1ii—N1—C1—O2	69.4 (9)	Tl1vii—N3—C3—N4	130.2 (8)
Tl1vi—N1—C1—O2	40.0 (11)	Tl1viii—N3—C3—N4	−162.5 (7)
O1—N1—C1—C2	−175.0 (8)	O3—N3—C3—C2	1.0 (10)
Tl1—N1—C1—C2	174.8 (8)	Tl1vii—N3—C3—C2	−52.4 (10)
Tl1ii—N1—C1—C2	−107.4 (9)	Tl1viii—N3—C3—C2	14.8 (11)
Tl1vi—N1—C1—C2	−136.8 (6)	Tl1ix—N4—C3—N3	29.1 (18)
O1—N1—C1—Tl1ii	−67.6 (9)	Tl1ix—N4—C3—C2	−147.8 (9)
Tl1—N1—C1—Tl1ii	−77.8 (4)	N2—C2—C3—N3	−1.1 (11)
Tl1vi—N1—C1—Tl1ii	−29.4 (5)	C1—C2—C3—N3	174.6 (9)
O1—N1—C1—Tl1	10.2 (7)	Tl1ii—C2—C3—N3	85.0 (10)
Tl1ii—N1—C1—Tl1	77.8 (4)	Tl1i—C2—C3—N3	−27.9 (19)
Tl1vi—N1—C1—Tl1	48.4 (2)	N2—C2—C3—N4	176.1 (9)
O1—N1—C1—Tl1i	36 (2)	C1—C2—C3—N4	−8.2 (16)
Tl1—N1—C1—Tl1i	26.0 (17)	Tl1ii—C2—C3—N4	−97.8 (11)
Tl1ii—N1—C1—Tl1i	103.8 (19)	Tl1i—C2—C3—N4	149.3 (12)

D—H···A	D—H	H···A	D···A	D—H···A
N4—H4A···N3x	0.93	2.23	3.156 (10)	169
N4—H4B···N1ix	1.01	2.65	3.256 (13)	118