metal-organic compounds
Bis{2-[(E)-(5-tert-butyl-2-hydroxyphenyl)diazenyl]benzoato}dimethyltin(IV)
aDepartment of Chemistry, North-Eastern Hill University, NEHU Permanent Campus, Umshing, Shillong 793 022, India, and bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: Edward.Tiekink@gmail.com
In the title diorganotin dicarboxylate, [Sn(CH3)2(C17H17N2O3)2], the tin(IV) atom is six-coordinated by four O atoms derived from asymmetrically coordinating carboxylate ligands, and two methyl-C atoms. The resulting C2O4 donor set defines a skew-trapezoidal bipyramid with the Sn—C bonds disposed over the weaker Sn—O bonds. Within each carboxylate ligand, the hydroxyl-H atom forms bifurcated O—H⋯(O,N) hydrogen bonds with carboxylate-O and azo-N atoms. The dihedral angles between the benzene rings in the two ligands are 10.44 (11) and 34.24 (11)°. In the crystal, centrosymmetric dimers are formed through pairs of Sn⋯O interactions [2.8802 (16) Å], and the dimers are linked into supramolecular layers in the ac plane by C—H⋯π interactions.
Related literature
For background to the potential anti-cancer activity of related compounds, see: Basu Baul et al. (2011). For the synthesis of the ligand, see: Basu Baul et al. (2008). For related structural studies, see: Basu Baul et al. (2010). For a review of the structural chemistry of organotin carboxylates, see: Tiekink (1991).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS86 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536811036543/hb6399sup1.cif
contains datablocks general, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811036543/hb6399Isup2.hkl
The title compound was prepared by reacting 2-[(E)-(5-tert-butyl-2-hydroxyphenyl)diazenyl]benzoic acid (Basu Baul et al., 2008) (0.30 g, 1.00 mmol) and Me2SnO (0.08 g, 0.49 mmol) in anhydrous toluene (50 ml) using a Dean and Stark apparatus for 6 h. The red solution was filtered while hot, concentrated to one tenth of its initial volume and precipitated with hexane. The red precipitate was separated by filtration, washed with hexane (2 x 5 ml) and dried in vacuo. The dried residue was dissolved in chloroform-hexane (10:1 v/v) and filtered. The filtrate was allowed to evaporate at room temperature, which afforded red prisms. Yield: 0.15 g, 40%, M.pt. 439–441 K. Elemental analysis, found: C 58.44, H 5.61, N 7.37%. C36H40N4O6Sn requires: C 58.14, H, 5.43, N 7.54%. IR (KBr, cm-1): 1589 ν(OCO)asym. 1H-NMR (CDCl3, 400.44 MHz): δ H: 12.8 [br, 1H, OH], 8.22 [d, 8 Hz, 1H, H7], 7.92 [d, 8 Hz, 1H, H4], 7.78 [d, 2.5 Hz, 1H, H13], 7.60 [t, 8 Hz, 1H, H5], 7.50 [t, 8 Hz, 1H, H6], 7.37 [dd, 2.5, 8 Hz, 1H, H11], 6.96 [d, 8 Hz, 1H, H10], 1.32 [s, 9H, CH3], 1.19 [s, 3H, Sn—CH3] p.p.m. 119Sn-NMR (CDCl3, 149.33): δ -112.7 p.p.m.
All H-atoms were placed in calculated positions (O—H = 0.84 Å, and C—H = 0.95–0.98 Å) and were included in the
in the riding model approximation with Uiso(H) set to 1.2–1.5Ueq(carrier atom).Organotin carboxylates related to the title compound, (I), have been investigated for potential anti-cancer activity (Basu Baul et al., 2011). Complementing biological studies are structural investigations (Basu Baul et al., 2010). In (I), the Sn atom is bound by two asymmetrically coordinating carboxylate ligands and two methyl groups, Fig. 1 and Table 1. The coordination geometry is based on a skew-trapezoidal bipyramid with the methyl groups disposed to lie over the weaker Sn—O bonds; the C35—Sn—C36 angle is 149.63 (10) °. The overall
matches those normally observed for structures of the general formula R2Sn(O2CR')2 (Tiekink, 1991).Centrosymmetrically related molecules associate into dimeric aggregates via weak Sn···O2i contacts of 2.8802 (16) Å, Fig. 1,
i: -x, 1 - y, -z. A consequence of this association is the significant lengthening of the Sn—O2 bond with respect to the chemically equivalent Sn—O5 bond, Table 1. The relative dispositions of the carboxylate residues are different in order to reduce Thus, while the hydroxy group of the O1-carboxylate ligand is orientated towards the more strongly coordinating O1 atom, the hydroxy group of the O4-carboxylate ligand is orientated towards the weakly coordinating O5 atom, Fig. 1. Within each carboxylate ligand, intramolecular O—H···O,N hydrogen bonds are noted, Table 2. Despite these, the ligands exhibit significant deviations from planarity. The values of the O1—C1—C2—C3 and O4—C18—C19—C20 torsion angles of 15.2 (3) and 158.7 (2) °, respectively, indicate that the carboxylate groups lie out of the plane of the respective benzene ring to which it is attached. Significant twisting is found in the O1-carboxylate ligand with the dihedral angle formed between the two benzene rings being 34.24 (11) °. This arises in part to avoid a steric clash with a benzene ring of the adjacent carboxylate ligand. The O4-carboxylate ligand, being directed away from the rest of the molecule, is less twisted with the dihedral angle formed between the two benzene rings being 10.44 (11) °.Over and above the intermolecular Sn···O interactions mentioned above, the most prominent feature of the crystal packing is the formation of C—H···π interactions, Table 2. These serve to link dimeric aggregates into supramolecular arrays in the ac plane. A view of the unit-cell contents is shown in Fig. 2 which highlights the stacking of layers along the b axis.
For background to the potential anti-cancer activity of related compounds, see: Basu Baul et al. (2011). For the synthesis of the ligand, see: Basu Baul et al. (2008). For related structural studies, see: Basu Baul et al. (2010). For a review of the structural chemistry of organotin carboxylates, see: Tiekink (1991).
Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS86 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).[Sn(CH3)2(C17H17N2O3)2] | F(000) = 1528 |
Mr = 743.43 | Dx = 1.452 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 9596 reflections |
a = 9.6298 (1) Å | θ = 2.5–27.5° |
b = 31.8788 (4) Å | µ = 0.80 mm−1 |
c = 11.0963 (1) Å | T = 100 K |
β = 93.502 (1)° | Prism, red |
V = 3400.05 (6) Å3 | 0.36 × 0.13 × 0.03 mm |
Z = 4 |
Bruker SMART APEXII diffractometer | 7749 independent reflections |
Radiation source: sealed tube | 6165 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.031 |
φ and ω scans | θmax = 27.5°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −12→12 |
Tmin = 0.895, Tmax = 1 | k = −41→31 |
26762 measured reflections | l = −13→14 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.033 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.071 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0302P)2 + 2.0032P] where P = (Fo2 + 2Fc2)/3 |
7749 reflections | (Δ/σ)max = 0.001 |
434 parameters | Δρmax = 0.55 e Å−3 |
0 restraints | Δρmin = −0.41 e Å−3 |
[Sn(CH3)2(C17H17N2O3)2] | V = 3400.05 (6) Å3 |
Mr = 743.43 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 9.6298 (1) Å | µ = 0.80 mm−1 |
b = 31.8788 (4) Å | T = 100 K |
c = 11.0963 (1) Å | 0.36 × 0.13 × 0.03 mm |
β = 93.502 (1)° |
Bruker SMART APEXII diffractometer | 7749 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 6165 reflections with I > 2σ(I) |
Tmin = 0.895, Tmax = 1 | Rint = 0.031 |
26762 measured reflections |
R[F2 > 2σ(F2)] = 0.033 | 0 restraints |
wR(F2) = 0.071 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.55 e Å−3 |
7749 reflections | Δρmin = −0.41 e Å−3 |
434 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Sn | 0.277358 (16) | 0.493245 (5) | 0.417857 (14) | 0.01732 (5) | |
O1 | 0.23555 (16) | 0.45124 (6) | 0.55829 (14) | 0.0217 (4) | |
O2 | 0.45495 (17) | 0.46778 (6) | 0.60060 (14) | 0.0216 (4) | |
O3 | 0.08900 (17) | 0.37965 (6) | 0.40295 (14) | 0.0236 (4) | |
H3 | 0.1412 | 0.3856 | 0.4639 | 0.035* | |
O4 | 0.06960 (16) | 0.47867 (6) | 0.36115 (14) | 0.0214 (4) | |
O5 | 0.16032 (17) | 0.52164 (6) | 0.23347 (14) | 0.0217 (4) | |
O6 | 0.18551 (16) | 0.60409 (6) | 0.13158 (15) | 0.0216 (4) | |
H6 | 0.1378 | 0.5823 | 0.1394 | 0.032* | |
N1 | 0.15350 (19) | 0.37784 (6) | 0.63135 (17) | 0.0165 (4) | |
N2 | 0.03907 (19) | 0.36266 (6) | 0.65957 (17) | 0.0175 (4) | |
N3 | −0.0403 (2) | 0.55980 (6) | 0.08342 (16) | 0.0180 (4) | |
N4 | −0.0860 (2) | 0.58421 (7) | 0.00045 (16) | 0.0177 (4) | |
C1 | 0.3515 (2) | 0.44669 (8) | 0.6217 (2) | 0.0180 (5) | |
C2 | 0.3565 (2) | 0.41453 (8) | 0.71981 (19) | 0.0163 (5) | |
C3 | 0.2554 (2) | 0.38306 (8) | 0.72847 (19) | 0.0157 (5) | |
C4 | 0.2650 (2) | 0.35474 (8) | 0.8236 (2) | 0.0187 (5) | |
H4 | 0.1963 | 0.3336 | 0.8294 | 0.022* | |
C5 | 0.3747 (2) | 0.35728 (8) | 0.9100 (2) | 0.0213 (5) | |
H5 | 0.3800 | 0.3382 | 0.9758 | 0.026* | |
C6 | 0.4769 (2) | 0.38759 (8) | 0.9010 (2) | 0.0219 (5) | |
H6A | 0.5530 | 0.3889 | 0.9596 | 0.026* | |
C7 | 0.4674 (2) | 0.41596 (8) | 0.8063 (2) | 0.0192 (5) | |
H7 | 0.5375 | 0.4367 | 0.8003 | 0.023* | |
C8 | −0.0562 (2) | 0.35492 (8) | 0.5600 (2) | 0.0164 (5) | |
C9 | −0.0301 (2) | 0.36295 (8) | 0.4384 (2) | 0.0176 (5) | |
C10 | −0.1336 (2) | 0.35283 (8) | 0.3498 (2) | 0.0200 (5) | |
H10 | −0.1185 | 0.3579 | 0.2673 | 0.024* | |
C11 | −0.2576 (2) | 0.33549 (8) | 0.3808 (2) | 0.0208 (5) | |
H11 | −0.3260 | 0.3287 | 0.3186 | 0.025* | |
C12 | −0.2865 (2) | 0.32747 (8) | 0.5013 (2) | 0.0180 (5) | |
C13 | −0.1839 (2) | 0.33798 (8) | 0.5883 (2) | 0.0185 (5) | |
H13 | −0.2009 | 0.3335 | 0.6707 | 0.022* | |
C14 | −0.4276 (2) | 0.30919 (8) | 0.5294 (2) | 0.0210 (5) | |
C15 | −0.4387 (3) | 0.30246 (10) | 0.6645 (2) | 0.0301 (6) | |
H15A | −0.5312 | 0.2915 | 0.6793 | 0.045* | |
H15B | −0.4242 | 0.3292 | 0.7069 | 0.045* | |
H15C | −0.3677 | 0.2823 | 0.6942 | 0.045* | |
C16 | −0.4500 (3) | 0.26688 (9) | 0.4652 (3) | 0.0303 (6) | |
H16A | −0.3785 | 0.2470 | 0.4956 | 0.046* | |
H16B | −0.4435 | 0.2707 | 0.3781 | 0.046* | |
H16C | −0.5422 | 0.2559 | 0.4810 | 0.046* | |
C17 | −0.5426 (3) | 0.33979 (9) | 0.4843 (2) | 0.0246 (6) | |
H17A | −0.6334 | 0.3287 | 0.5038 | 0.037* | |
H17B | −0.5403 | 0.3432 | 0.3967 | 0.037* | |
H17C | −0.5275 | 0.3671 | 0.5237 | 0.037* | |
C18 | 0.0605 (2) | 0.49959 (8) | 0.2613 (2) | 0.0190 (5) | |
C19 | −0.0703 (2) | 0.49363 (8) | 0.1842 (2) | 0.0182 (5) | |
C20 | −0.1186 (2) | 0.52255 (8) | 0.09590 (19) | 0.0163 (5) | |
C21 | −0.2430 (2) | 0.51461 (8) | 0.0285 (2) | 0.0203 (5) | |
H21 | −0.2772 | 0.5343 | −0.0303 | 0.024* | |
C22 | −0.3161 (3) | 0.47835 (9) | 0.0468 (2) | 0.0236 (6) | |
H22 | −0.4002 | 0.4730 | −0.0001 | 0.028* | |
C23 | −0.2682 (3) | 0.44941 (9) | 0.1332 (2) | 0.0242 (6) | |
H23 | −0.3191 | 0.4244 | 0.1454 | 0.029* | |
C24 | −0.1463 (2) | 0.45724 (8) | 0.2012 (2) | 0.0216 (5) | |
H24 | −0.1137 | 0.4375 | 0.2605 | 0.026* | |
C25 | −0.0119 (2) | 0.62188 (8) | −0.00658 (19) | 0.0164 (5) | |
C26 | 0.1145 (2) | 0.63123 (8) | 0.0583 (2) | 0.0174 (5) | |
C27 | 0.1705 (2) | 0.67117 (8) | 0.0446 (2) | 0.0205 (5) | |
H27 | 0.2574 | 0.6780 | 0.0851 | 0.025* | |
C28 | 0.1019 (2) | 0.70090 (8) | −0.0266 (2) | 0.0191 (5) | |
H28 | 0.1415 | 0.7281 | −0.0316 | 0.023* | |
C29 | −0.0242 (2) | 0.69246 (8) | −0.09212 (19) | 0.0155 (5) | |
C30 | −0.0765 (2) | 0.65243 (8) | −0.08173 (19) | 0.0167 (5) | |
H30 | −0.1598 | 0.6453 | −0.1274 | 0.020* | |
C31 | −0.0990 (2) | 0.72721 (8) | −0.1662 (2) | 0.0176 (5) | |
C32 | −0.2250 (2) | 0.71042 (8) | −0.2421 (2) | 0.0235 (5) | |
H32A | −0.2927 | 0.6988 | −0.1887 | 0.035* | |
H32B | −0.1949 | 0.6884 | −0.2962 | 0.035* | |
H32C | −0.2682 | 0.7333 | −0.2900 | 0.035* | |
C33 | −0.1492 (3) | 0.76023 (8) | −0.0787 (2) | 0.0217 (5) | |
H33A | −0.1977 | 0.7827 | −0.1244 | 0.033* | |
H33B | −0.0691 | 0.7719 | −0.0313 | 0.033* | |
H33C | −0.2130 | 0.7472 | −0.0242 | 0.033* | |
C34 | 0.0008 (2) | 0.74802 (8) | −0.2511 (2) | 0.0206 (5) | |
H34A | −0.0475 | 0.7708 | −0.2955 | 0.031* | |
H34B | 0.0322 | 0.7272 | −0.3083 | 0.031* | |
H34C | 0.0814 | 0.7593 | −0.2035 | 0.031* | |
C35 | 0.2588 (3) | 0.55181 (8) | 0.4982 (2) | 0.0254 (6) | |
H35A | 0.3164 | 0.5526 | 0.5741 | 0.038* | |
H35B | 0.1614 | 0.5568 | 0.5147 | 0.038* | |
H35C | 0.2900 | 0.5736 | 0.4437 | 0.038* | |
C36 | 0.3840 (3) | 0.45265 (8) | 0.3069 (2) | 0.0247 (6) | |
H36A | 0.4412 | 0.4691 | 0.2541 | 0.037* | |
H36B | 0.3167 | 0.4359 | 0.2575 | 0.037* | |
H36C | 0.4439 | 0.4339 | 0.3571 | 0.037* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Sn | 0.01744 (8) | 0.01519 (9) | 0.01906 (8) | −0.00012 (7) | −0.00111 (5) | 0.00331 (7) |
O1 | 0.0198 (9) | 0.0215 (10) | 0.0234 (9) | −0.0022 (7) | −0.0033 (7) | 0.0076 (7) |
O2 | 0.0215 (9) | 0.0198 (10) | 0.0234 (9) | −0.0055 (7) | 0.0016 (7) | 0.0046 (7) |
O3 | 0.0213 (9) | 0.0288 (11) | 0.0209 (9) | −0.0067 (8) | 0.0034 (7) | −0.0011 (8) |
O4 | 0.0198 (8) | 0.0237 (10) | 0.0202 (8) | −0.0014 (7) | −0.0034 (6) | 0.0076 (7) |
O5 | 0.0186 (8) | 0.0233 (10) | 0.0230 (8) | −0.0011 (7) | −0.0016 (7) | 0.0054 (7) |
O6 | 0.0180 (8) | 0.0192 (10) | 0.0269 (9) | −0.0003 (7) | −0.0045 (7) | 0.0059 (7) |
N1 | 0.0160 (10) | 0.0126 (11) | 0.0207 (10) | −0.0010 (8) | 0.0000 (7) | 0.0002 (8) |
N2 | 0.0162 (10) | 0.0158 (12) | 0.0205 (10) | 0.0001 (8) | 0.0010 (8) | 0.0002 (8) |
N3 | 0.0196 (10) | 0.0169 (12) | 0.0172 (10) | 0.0029 (8) | −0.0004 (8) | 0.0013 (8) |
N4 | 0.0199 (10) | 0.0180 (12) | 0.0150 (9) | 0.0027 (8) | 0.0011 (7) | 0.0008 (8) |
C1 | 0.0200 (12) | 0.0168 (14) | 0.0171 (11) | −0.0002 (10) | 0.0014 (9) | −0.0014 (9) |
C2 | 0.0176 (11) | 0.0144 (13) | 0.0170 (11) | 0.0010 (9) | 0.0017 (9) | −0.0004 (9) |
C3 | 0.0141 (11) | 0.0169 (14) | 0.0164 (11) | 0.0021 (9) | 0.0016 (8) | −0.0010 (9) |
C4 | 0.0183 (12) | 0.0179 (14) | 0.0202 (11) | −0.0027 (10) | 0.0041 (9) | 0.0000 (10) |
C5 | 0.0232 (12) | 0.0237 (15) | 0.0171 (11) | 0.0019 (10) | 0.0017 (9) | 0.0040 (10) |
C6 | 0.0190 (12) | 0.0273 (16) | 0.0188 (12) | 0.0014 (10) | −0.0028 (9) | −0.0013 (10) |
C7 | 0.0180 (12) | 0.0196 (14) | 0.0201 (11) | −0.0025 (10) | 0.0011 (9) | −0.0010 (10) |
C8 | 0.0170 (11) | 0.0126 (13) | 0.0197 (11) | 0.0031 (9) | 0.0010 (9) | −0.0005 (9) |
C9 | 0.0183 (11) | 0.0132 (13) | 0.0215 (12) | 0.0010 (9) | 0.0030 (9) | −0.0009 (9) |
C10 | 0.0251 (13) | 0.0195 (14) | 0.0155 (11) | 0.0013 (10) | 0.0030 (9) | −0.0032 (9) |
C11 | 0.0204 (12) | 0.0203 (15) | 0.0212 (12) | 0.0011 (10) | −0.0027 (9) | −0.0060 (10) |
C12 | 0.0154 (11) | 0.0145 (14) | 0.0239 (12) | 0.0022 (9) | 0.0013 (9) | −0.0017 (10) |
C13 | 0.0172 (11) | 0.0188 (14) | 0.0194 (11) | 0.0029 (10) | 0.0016 (9) | 0.0000 (10) |
C14 | 0.0161 (12) | 0.0210 (15) | 0.0257 (12) | −0.0005 (10) | 0.0003 (9) | −0.0021 (10) |
C15 | 0.0187 (12) | 0.0437 (19) | 0.0281 (14) | −0.0076 (12) | 0.0015 (10) | 0.0069 (12) |
C16 | 0.0184 (13) | 0.0252 (17) | 0.0471 (16) | −0.0022 (11) | 0.0003 (12) | −0.0053 (13) |
C17 | 0.0198 (12) | 0.0253 (16) | 0.0288 (13) | 0.0023 (11) | 0.0007 (10) | −0.0038 (11) |
C18 | 0.0195 (11) | 0.0175 (15) | 0.0200 (11) | 0.0025 (10) | 0.0008 (9) | 0.0000 (9) |
C19 | 0.0193 (11) | 0.0197 (13) | 0.0157 (10) | 0.0018 (10) | 0.0005 (8) | 0.0001 (10) |
C20 | 0.0185 (11) | 0.0167 (13) | 0.0138 (10) | 0.0024 (9) | 0.0023 (8) | −0.0011 (9) |
C21 | 0.0231 (12) | 0.0188 (15) | 0.0188 (11) | 0.0019 (10) | −0.0007 (9) | −0.0010 (10) |
C22 | 0.0218 (12) | 0.0262 (15) | 0.0221 (12) | −0.0020 (11) | −0.0040 (9) | −0.0023 (11) |
C23 | 0.0259 (13) | 0.0224 (15) | 0.0244 (12) | −0.0053 (11) | 0.0027 (10) | 0.0005 (11) |
C24 | 0.0235 (12) | 0.0215 (15) | 0.0196 (12) | 0.0016 (10) | −0.0004 (9) | 0.0038 (10) |
C25 | 0.0179 (11) | 0.0161 (15) | 0.0154 (10) | 0.0014 (9) | 0.0028 (8) | −0.0004 (9) |
C26 | 0.0156 (11) | 0.0191 (14) | 0.0176 (11) | 0.0043 (9) | 0.0010 (9) | 0.0014 (9) |
C27 | 0.0150 (11) | 0.0238 (15) | 0.0224 (12) | −0.0012 (10) | −0.0022 (9) | 0.0012 (10) |
C28 | 0.0207 (12) | 0.0160 (14) | 0.0206 (12) | −0.0028 (10) | 0.0008 (9) | 0.0000 (10) |
C29 | 0.0153 (11) | 0.0192 (14) | 0.0122 (10) | 0.0013 (9) | 0.0018 (8) | −0.0003 (9) |
C30 | 0.0147 (11) | 0.0220 (14) | 0.0134 (10) | 0.0000 (9) | 0.0008 (8) | −0.0013 (9) |
C31 | 0.0166 (11) | 0.0181 (14) | 0.0178 (11) | −0.0004 (9) | −0.0006 (9) | 0.0017 (9) |
C32 | 0.0244 (13) | 0.0212 (15) | 0.0239 (12) | 0.0008 (10) | −0.0064 (10) | 0.0041 (10) |
C33 | 0.0235 (13) | 0.0203 (15) | 0.0213 (12) | 0.0030 (10) | 0.0017 (9) | 0.0008 (10) |
C34 | 0.0260 (12) | 0.0148 (15) | 0.0211 (11) | 0.0024 (10) | 0.0029 (9) | 0.0026 (10) |
C35 | 0.0271 (13) | 0.0199 (15) | 0.0292 (14) | 0.0030 (11) | 0.0027 (10) | −0.0013 (11) |
C36 | 0.0256 (13) | 0.0215 (15) | 0.0266 (13) | 0.0019 (11) | −0.0012 (10) | −0.0032 (11) |
Sn—O1 | 2.1118 (16) | C15—H15C | 0.9800 |
Sn—O2 | 2.6967 (16) | C16—H16A | 0.9800 |
Sn—O4 | 2.1120 (16) | C16—H16B | 0.9800 |
Sn—O5 | 2.4482 (16) | C16—H16C | 0.9800 |
Sn—C35 | 2.081 (3) | C17—H17A | 0.9800 |
Sn—C36 | 2.098 (2) | C17—H17B | 0.9800 |
Sn—O2i | 2.8802 (16) | C17—H17C | 0.9800 |
O1—C1 | 1.291 (3) | C18—C19 | 1.491 (3) |
O2—C1 | 1.236 (3) | C19—C24 | 1.391 (3) |
O3—C9 | 1.345 (3) | C19—C20 | 1.404 (3) |
O3—H3 | 0.8400 | C20—C21 | 1.396 (3) |
O4—C18 | 1.291 (3) | C21—C22 | 1.375 (4) |
O5—C18 | 1.245 (3) | C21—H21 | 0.9500 |
O6—C26 | 1.345 (3) | C22—C23 | 1.389 (4) |
O6—H6 | 0.8400 | C22—H22 | 0.9500 |
N1—N2 | 1.260 (3) | C23—C24 | 1.379 (3) |
N1—C3 | 1.422 (3) | C23—H23 | 0.9500 |
N2—C8 | 1.414 (3) | C24—H24 | 0.9500 |
N3—N4 | 1.264 (3) | C25—C30 | 1.403 (3) |
N3—C20 | 1.418 (3) | C25—C26 | 1.408 (3) |
N4—C25 | 1.402 (3) | C26—C27 | 1.395 (3) |
C1—C2 | 1.494 (3) | C27—C28 | 1.377 (3) |
C2—C7 | 1.392 (3) | C27—H27 | 0.9500 |
C2—C3 | 1.405 (3) | C28—C29 | 1.403 (3) |
C3—C4 | 1.388 (3) | C28—H28 | 0.9500 |
C4—C5 | 1.385 (3) | C29—C30 | 1.379 (3) |
C4—H4 | 0.9500 | C29—C31 | 1.533 (3) |
C5—C6 | 1.387 (3) | C30—H30 | 0.9500 |
C5—H5 | 0.9500 | C31—C33 | 1.530 (3) |
C6—C7 | 1.385 (3) | C31—C32 | 1.531 (3) |
C6—H6A | 0.9500 | C31—C34 | 1.536 (3) |
C7—H7 | 0.9500 | C32—H32A | 0.9800 |
C8—C13 | 1.397 (3) | C32—H32B | 0.9800 |
C8—C9 | 1.411 (3) | C32—H32C | 0.9800 |
C9—C10 | 1.394 (3) | C33—H33A | 0.9800 |
C10—C11 | 1.379 (3) | C33—H33B | 0.9800 |
C10—H10 | 0.9500 | C33—H33C | 0.9800 |
C11—C12 | 1.405 (3) | C34—H34A | 0.9800 |
C11—H11 | 0.9500 | C34—H34B | 0.9800 |
C12—C13 | 1.379 (3) | C34—H34C | 0.9800 |
C12—C14 | 1.529 (3) | C35—H35A | 0.9800 |
C13—H13 | 0.9500 | C35—H35B | 0.9800 |
C14—C15 | 1.525 (3) | C35—H35C | 0.9800 |
C14—C16 | 1.534 (4) | C36—H36A | 0.9800 |
C14—C17 | 1.536 (3) | C36—H36B | 0.9800 |
C15—H15A | 0.9800 | C36—H36C | 0.9800 |
C15—H15B | 0.9800 | ||
C35—Sn—C36 | 149.63 (10) | C14—C16—H16B | 109.5 |
C35—Sn—O4 | 102.74 (9) | H16A—C16—H16B | 109.5 |
C36—Sn—O4 | 100.26 (8) | C14—C16—H16C | 109.5 |
C35—Sn—O1 | 103.14 (9) | H16A—C16—H16C | 109.5 |
C36—Sn—O1 | 99.46 (9) | H16B—C16—H16C | 109.5 |
O4—Sn—O1 | 81.98 (6) | C14—C17—H17A | 109.5 |
C35—Sn—O5 | 88.82 (8) | C14—C17—H17B | 109.5 |
C36—Sn—O5 | 87.38 (8) | H17A—C17—H17B | 109.5 |
O4—Sn—O5 | 56.84 (6) | C14—C17—H17C | 109.5 |
O1—Sn—O5 | 138.79 (6) | H17A—C17—H17C | 109.5 |
C35—Sn—C18 | 97.36 (9) | H17B—C17—H17C | 109.5 |
C36—Sn—C18 | 93.25 (8) | O5—C18—O4 | 119.5 (2) |
O4—Sn—C18 | 28.89 (7) | O5—C18—C19 | 124.6 (2) |
O1—Sn—C18 | 110.80 (7) | O4—C18—C19 | 115.9 (2) |
O5—Sn—C18 | 27.98 (6) | O5—C18—Sn | 67.37 (12) |
C35—Sn—O2 | 90.85 (8) | O4—C18—Sn | 52.20 (11) |
C36—Sn—O2 | 86.85 (8) | C19—C18—Sn | 166.89 (17) |
O4—Sn—O2 | 134.70 (6) | C24—C19—C20 | 119.2 (2) |
O1—Sn—O2 | 52.77 (5) | C24—C19—C18 | 117.5 (2) |
O5—Sn—O2 | 168.00 (5) | C20—C19—C18 | 123.3 (2) |
C18—Sn—O2 | 163.18 (6) | C21—C20—C19 | 119.5 (2) |
C35—Sn—O2i | 75.17 (8) | C21—C20—N3 | 122.9 (2) |
C36—Sn—O2i | 75.64 (8) | C19—C20—N3 | 117.6 (2) |
O4—Sn—O2i | 155.42 (5) | C22—C21—C20 | 120.3 (2) |
O1—Sn—O2i | 122.54 (5) | C22—C21—H21 | 119.9 |
O5—Sn—O2i | 98.59 (5) | C20—C21—H21 | 119.9 |
C18—Sn—O2i | 126.53 (6) | C21—C22—C23 | 120.5 (2) |
O2—Sn—O2i | 69.77 (5) | C21—C22—H22 | 119.7 |
C1—O1—Sn | 106.00 (14) | C23—C22—H22 | 119.7 |
C1—O2—Sn | 79.89 (13) | C24—C23—C22 | 119.6 (2) |
C9—O3—H3 | 109.5 | C24—C23—H23 | 120.2 |
C18—O4—Sn | 98.92 (14) | C22—C23—H23 | 120.2 |
C18—O5—Sn | 84.64 (13) | C23—C24—C19 | 120.9 (2) |
C26—O6—H6 | 109.5 | C23—C24—H24 | 119.5 |
N2—N1—C3 | 115.46 (18) | C19—C24—H24 | 119.5 |
N1—N2—C8 | 114.07 (18) | N4—C25—C30 | 114.8 (2) |
N4—N3—C20 | 115.05 (19) | N4—C25—C26 | 125.5 (2) |
N3—N4—C25 | 114.36 (19) | C30—C25—C26 | 119.7 (2) |
O2—C1—O1 | 121.1 (2) | O6—C26—C27 | 117.8 (2) |
O2—C1—C2 | 121.4 (2) | O6—C26—C25 | 124.4 (2) |
O1—C1—C2 | 117.5 (2) | C27—C26—C25 | 117.8 (2) |
C7—C2—C3 | 118.8 (2) | C28—C27—C26 | 121.0 (2) |
C7—C2—C1 | 118.0 (2) | C28—C27—H27 | 119.5 |
C3—C2—C1 | 123.3 (2) | C26—C27—H27 | 119.5 |
C4—C3—C2 | 120.2 (2) | C27—C28—C29 | 122.4 (2) |
C4—C3—N1 | 120.7 (2) | C27—C28—H28 | 118.8 |
C2—C3—N1 | 118.7 (2) | C29—C28—H28 | 118.8 |
C5—C4—C3 | 120.1 (2) | C30—C29—C28 | 116.3 (2) |
C5—C4—H4 | 120.0 | C30—C29—C31 | 123.4 (2) |
C3—C4—H4 | 120.0 | C28—C29—C31 | 120.2 (2) |
C4—C5—C6 | 120.4 (2) | C29—C30—C25 | 122.7 (2) |
C4—C5—H5 | 119.8 | C29—C30—H30 | 118.6 |
C6—C5—H5 | 119.8 | C25—C30—H30 | 118.6 |
C7—C6—C5 | 119.7 (2) | C33—C31—C32 | 108.61 (19) |
C7—C6—H6A | 120.2 | C33—C31—C29 | 108.23 (18) |
C5—C6—H6A | 120.2 | C32—C31—C29 | 111.9 (2) |
C6—C7—C2 | 120.9 (2) | C33—C31—C34 | 109.0 (2) |
C6—C7—H7 | 119.5 | C32—C31—C34 | 108.57 (19) |
C2—C7—H7 | 119.5 | C29—C31—C34 | 110.45 (18) |
C13—C8—C9 | 119.7 (2) | C31—C32—H32A | 109.5 |
C13—C8—N2 | 115.5 (2) | C31—C32—H32B | 109.5 |
C9—C8—N2 | 124.8 (2) | H32A—C32—H32B | 109.5 |
O3—C9—C10 | 118.1 (2) | C31—C32—H32C | 109.5 |
O3—C9—C8 | 123.8 (2) | H32A—C32—H32C | 109.5 |
C10—C9—C8 | 118.1 (2) | H32B—C32—H32C | 109.5 |
C11—C10—C9 | 120.6 (2) | C31—C33—H33A | 109.5 |
C11—C10—H10 | 119.7 | C31—C33—H33B | 109.5 |
C9—C10—H10 | 119.7 | H33A—C33—H33B | 109.5 |
C10—C11—C12 | 122.4 (2) | C31—C33—H33C | 109.5 |
C10—C11—H11 | 118.8 | H33A—C33—H33C | 109.5 |
C12—C11—H11 | 118.8 | H33B—C33—H33C | 109.5 |
C13—C12—C11 | 116.5 (2) | C31—C34—H34A | 109.5 |
C13—C12—C14 | 123.9 (2) | C31—C34—H34B | 109.5 |
C11—C12—C14 | 119.6 (2) | H34A—C34—H34B | 109.5 |
C12—C13—C8 | 122.6 (2) | C31—C34—H34C | 109.5 |
C12—C13—H13 | 118.7 | H34A—C34—H34C | 109.5 |
C8—C13—H13 | 118.7 | H34B—C34—H34C | 109.5 |
C15—C14—C12 | 111.73 (19) | Sn—C35—H35A | 109.5 |
C15—C14—C16 | 108.4 (2) | Sn—C35—H35B | 109.5 |
C12—C14—C16 | 110.0 (2) | H35A—C35—H35B | 109.5 |
C15—C14—C17 | 108.5 (2) | Sn—C35—H35C | 109.5 |
C12—C14—C17 | 108.9 (2) | H35A—C35—H35C | 109.5 |
C16—C14—C17 | 109.2 (2) | H35B—C35—H35C | 109.5 |
C14—C15—H15A | 109.5 | Sn—C36—H36A | 109.5 |
C14—C15—H15B | 109.5 | Sn—C36—H36B | 109.5 |
H15A—C15—H15B | 109.5 | H36A—C36—H36B | 109.5 |
C14—C15—H15C | 109.5 | Sn—C36—H36C | 109.5 |
H15A—C15—H15C | 109.5 | H36A—C36—H36C | 109.5 |
H15B—C15—H15C | 109.5 | H36B—C36—H36C | 109.5 |
C14—C16—H16A | 109.5 | ||
C35—Sn—O1—C1 | −83.78 (16) | C11—C12—C14—C16 | 59.1 (3) |
C36—Sn—O1—C1 | 75.78 (16) | C13—C12—C14—C17 | 117.6 (3) |
O4—Sn—O1—C1 | 174.93 (16) | C11—C12—C14—C17 | −60.6 (3) |
O5—Sn—O1—C1 | 172.67 (13) | Sn—O5—C18—O4 | 3.3 (2) |
C18—Sn—O1—C1 | 172.96 (15) | Sn—O5—C18—C19 | −173.8 (2) |
O2—Sn—O1—C1 | −2.88 (13) | Sn—O4—C18—O5 | −3.9 (2) |
O2i—Sn—O1—C1 | −3.15 (17) | Sn—O4—C18—C19 | 173.52 (17) |
C35—Sn—O2—C1 | 108.86 (15) | C35—Sn—C18—O5 | 73.29 (15) |
C36—Sn—O2—C1 | −101.45 (16) | C36—Sn—C18—O5 | −78.19 (15) |
O4—Sn—O2—C1 | −0.12 (17) | O4—Sn—C18—O5 | 176.4 (2) |
O1—Sn—O2—C1 | 2.94 (14) | O1—Sn—C18—O5 | −179.59 (13) |
O5—Sn—O2—C1 | −162.8 (3) | O2—Sn—C18—O5 | −168.08 (17) |
C18—Sn—O2—C1 | −10.6 (3) | O2i—Sn—C18—O5 | −3.68 (17) |
O2i—Sn—O2—C1 | −177.31 (17) | C35—Sn—C18—O4 | −103.08 (15) |
C35—Sn—O4—C18 | 82.07 (16) | C36—Sn—C18—O4 | 105.44 (15) |
C36—Sn—O4—C18 | −77.96 (16) | O1—Sn—C18—O4 | 4.04 (16) |
O1—Sn—O4—C18 | −176.19 (15) | O5—Sn—C18—O4 | −176.4 (2) |
O5—Sn—O4—C18 | 2.03 (13) | O2—Sn—C18—O4 | 15.6 (3) |
O2—Sn—O4—C18 | −173.73 (12) | O2i—Sn—C18—O4 | 179.96 (12) |
O2i—Sn—O4—C18 | −0.1 (2) | C35—Sn—C18—C19 | −129.7 (7) |
C35—Sn—O5—C18 | −108.18 (15) | C36—Sn—C18—C19 | 78.9 (7) |
C36—Sn—O5—C18 | 101.96 (16) | O4—Sn—C18—C19 | −26.6 (7) |
O4—Sn—O5—C18 | −2.09 (13) | O1—Sn—C18—C19 | −22.6 (7) |
O1—Sn—O5—C18 | 0.57 (18) | O5—Sn—C18—C19 | 157.0 (8) |
O2—Sn—O5—C18 | 163.3 (2) | O2—Sn—C18—C19 | −11.0 (9) |
O2i—Sn—O5—C18 | 177.01 (14) | O2i—Sn—C18—C19 | 153.4 (7) |
C3—N1—N2—C8 | −175.48 (19) | O5—C18—C19—C24 | 155.3 (2) |
C20—N3—N4—C25 | 176.77 (18) | O4—C18—C19—C24 | −21.9 (3) |
Sn—O2—C1—O1 | −4.5 (2) | Sn—C18—C19—C24 | 1.2 (8) |
Sn—O2—C1—C2 | 174.5 (2) | O5—C18—C19—C20 | −24.1 (4) |
Sn—O1—C1—O2 | 5.9 (3) | O4—C18—C19—C20 | 158.7 (2) |
Sn—O1—C1—C2 | −173.12 (16) | Sn—C18—C19—C20 | −178.2 (6) |
O2—C1—C2—C7 | 16.0 (3) | C24—C19—C20—C21 | 1.2 (3) |
O1—C1—C2—C7 | −165.0 (2) | C18—C19—C20—C21 | −179.5 (2) |
O2—C1—C2—C3 | −163.7 (2) | C24—C19—C20—N3 | 178.4 (2) |
O1—C1—C2—C3 | 15.2 (3) | C18—C19—C20—N3 | −2.3 (3) |
C7—C2—C3—C4 | 1.6 (3) | N4—N3—C20—C21 | −4.8 (3) |
C1—C2—C3—C4 | −178.6 (2) | N4—N3—C20—C19 | 178.1 (2) |
C7—C2—C3—N1 | −171.1 (2) | C19—C20—C21—C22 | −1.3 (3) |
C1—C2—C3—N1 | 8.6 (3) | N3—C20—C21—C22 | −178.3 (2) |
N2—N1—C3—C4 | 34.5 (3) | C20—C21—C22—C23 | 0.7 (4) |
N2—N1—C3—C2 | −152.8 (2) | C21—C22—C23—C24 | 0.1 (4) |
C2—C3—C4—C5 | −0.3 (3) | C22—C23—C24—C19 | −0.2 (4) |
N1—C3—C4—C5 | 172.3 (2) | C20—C19—C24—C23 | −0.4 (4) |
C3—C4—C5—C6 | −1.1 (4) | C18—C19—C24—C23 | −179.8 (2) |
C4—C5—C6—C7 | 1.3 (4) | N3—N4—C25—C30 | −168.2 (2) |
C5—C6—C7—C2 | 0.1 (4) | N3—N4—C25—C26 | 8.9 (3) |
C3—C2—C7—C6 | −1.5 (3) | N4—C25—C26—O6 | 3.8 (4) |
C1—C2—C7—C6 | 178.7 (2) | C30—C25—C26—O6 | −179.2 (2) |
N1—N2—C8—C13 | 179.8 (2) | N4—C25—C26—C27 | −176.9 (2) |
N1—N2—C8—C9 | 0.0 (3) | C30—C25—C26—C27 | 0.0 (3) |
C13—C8—C9—O3 | 179.2 (2) | O6—C26—C27—C28 | −178.4 (2) |
N2—C8—C9—O3 | −1.0 (4) | C25—C26—C27—C28 | 2.3 (3) |
C13—C8—C9—C10 | −1.1 (4) | C26—C27—C28—C29 | −2.3 (4) |
N2—C8—C9—C10 | 178.7 (2) | C27—C28—C29—C30 | −0.2 (3) |
O3—C9—C10—C11 | 179.8 (2) | C27—C28—C29—C31 | 177.6 (2) |
C8—C9—C10—C11 | 0.0 (4) | C28—C29—C30—C25 | 2.5 (3) |
C9—C10—C11—C12 | 0.5 (4) | C31—C29—C30—C25 | −175.2 (2) |
C10—C11—C12—C13 | 0.2 (4) | N4—C25—C30—C29 | 174.8 (2) |
C10—C11—C12—C14 | 178.5 (2) | C26—C25—C30—C29 | −2.5 (3) |
C11—C12—C13—C8 | −1.3 (4) | C30—C29—C31—C33 | 110.7 (2) |
C14—C12—C13—C8 | −179.5 (2) | C28—C29—C31—C33 | −67.0 (3) |
C9—C8—C13—C12 | 1.8 (4) | C30—C29—C31—C32 | −9.0 (3) |
N2—C8—C13—C12 | −178.0 (2) | C28—C29—C31—C32 | 173.4 (2) |
C13—C12—C14—C15 | −2.2 (3) | C30—C29—C31—C34 | −130.1 (2) |
C11—C12—C14—C15 | 179.6 (2) | C28—C29—C31—C34 | 52.3 (3) |
C13—C12—C14—C16 | −122.7 (3) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Cg1 is the centroid of the C25–C30 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3···O1 | 0.84 | 2.49 | 3.142 (2) | 136 |
O3—H3···N1 | 0.84 | 1.87 | 2.573 (2) | 140 |
O6—H6···O5 | 0.84 | 2.20 | 2.877 (3) | 137 |
O6—H6···N3 | 0.84 | 1.93 | 2.620 (3) | 139 |
C10—H10···Cg1ii | 0.95 | 2.97 | 3.863 (2) | 157 |
Symmetry code: (ii) −x, −y+1, −z. |
Experimental details
Crystal data | |
Chemical formula | [Sn(CH3)2(C17H17N2O3)2] |
Mr | 743.43 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 9.6298 (1), 31.8788 (4), 11.0963 (1) |
β (°) | 93.502 (1) |
V (Å3) | 3400.05 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.80 |
Crystal size (mm) | 0.36 × 0.13 × 0.03 |
Data collection | |
Diffractometer | Bruker SMART APEXII |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.895, 1 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 26762, 7749, 6165 |
Rint | 0.031 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.071, 1.04 |
No. of reflections | 7749 |
No. of parameters | 434 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.55, −0.41 |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS86 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006).
Sn—O1 | 2.1118 (16) | Sn—O5 | 2.4482 (16) |
Sn—O2 | 2.6967 (16) | Sn—C35 | 2.081 (3) |
Sn—O4 | 2.1120 (16) | Sn—C36 | 2.098 (2) |
Cg1 is the centroid of the C25–C30 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3···O1 | 0.84 | 2.49 | 3.142 (2) | 136 |
O3—H3···N1 | 0.84 | 1.87 | 2.573 (2) | 140 |
O6—H6···O5 | 0.84 | 2.20 | 2.877 (3) | 137 |
O6—H6···N3 | 0.84 | 1.93 | 2.620 (3) | 139 |
C10—H10···Cg1i | 0.95 | 2.97 | 3.863 (2) | 157 |
Symmetry code: (i) −x, −y+1, −z. |
Footnotes
‡Additional correspondence author, e-mail: basubaul@hotmail.com.
Acknowledgements
The financial support of the Department of Science and Technology, New Delhi, India (grant No. SR/S1/IC-03/2005,TSBB), the Council of Scientific and Industrial Research, New Delhi, India [grant No. 09/347/(0197)/2011/EMR I, for the award of a Senior Research Fellowship to AP] and the University Grants Commission, New Delhi, India, through SAP–DSA, Phase-III, are gratefully acknowledged.
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Organotin carboxylates related to the title compound, (I), have been investigated for potential anti-cancer activity (Basu Baul et al., 2011). Complementing biological studies are structural investigations (Basu Baul et al., 2010). In (I), the Sn atom is bound by two asymmetrically coordinating carboxylate ligands and two methyl groups, Fig. 1 and Table 1. The coordination geometry is based on a skew-trapezoidal bipyramid with the methyl groups disposed to lie over the weaker Sn—O bonds; the C35—Sn—C36 angle is 149.63 (10) °. The overall molecular conformation matches those normally observed for structures of the general formula R2Sn(O2CR')2 (Tiekink, 1991).
Centrosymmetrically related molecules associate into dimeric aggregates via weak Sn···O2i contacts of 2.8802 (16) Å, Fig. 1, symmetry operation i: -x, 1 - y, -z. A consequence of this association is the significant lengthening of the Sn—O2 bond with respect to the chemically equivalent Sn—O5 bond, Table 1. The relative dispositions of the carboxylate residues are different in order to reduce steric hindrance. Thus, while the hydroxy group of the O1-carboxylate ligand is orientated towards the more strongly coordinating O1 atom, the hydroxy group of the O4-carboxylate ligand is orientated towards the weakly coordinating O5 atom, Fig. 1. Within each carboxylate ligand, intramolecular O—H···O,N hydrogen bonds are noted, Table 2. Despite these, the ligands exhibit significant deviations from planarity. The values of the O1—C1—C2—C3 and O4—C18—C19—C20 torsion angles of 15.2 (3) and 158.7 (2) °, respectively, indicate that the carboxylate groups lie out of the plane of the respective benzene ring to which it is attached. Significant twisting is found in the O1-carboxylate ligand with the dihedral angle formed between the two benzene rings being 34.24 (11) °. This arises in part to avoid a steric clash with a benzene ring of the adjacent carboxylate ligand. The O4-carboxylate ligand, being directed away from the rest of the molecule, is less twisted with the dihedral angle formed between the two benzene rings being 10.44 (11) °.
Over and above the intermolecular Sn···O interactions mentioned above, the most prominent feature of the crystal packing is the formation of C—H···π interactions, Table 2. These serve to link dimeric aggregates into supramolecular arrays in the ac plane. A view of the unit-cell contents is shown in Fig. 2 which highlights the stacking of layers along the b axis.