(2-Chloro-4-nitrobenzoato)(methanol)triphenyltin(IV)

In the title complex, [Sn(C6H5)3(C7H3ClNO4)(CH4O)], the five-coordinate SnIV atom exists in a trigonal–bipyramidal environment, formed by a monodentate carboxylate group, three phenyl rings and a methanol molecule. The axial sites are occupied by the O atoms of the methanol molecule and the carboxylate group, while the equatorial plane is formed by the C atoms of three phenyl rings. The benzene ring of the 2-chloro-4-nitrobenzoate ligand makes dihedral angles of 66.18 (7), 74.71 (7) and 77.39 (7)° with respect to the three phenyl rings. In the crystal, the molecules are linked via intermolecular O—H⋯O and C—H⋯O hydrogen bonds into a column along the b axis.

In the title complex, [Sn(C 6 H 5 ) 3 (C 7 H 3 ClNO 4 )(CH 4 O)], the five-coordinate Sn IV atom exists in a trigonal-bipyramidal environment, formed by a monodentate carboxylate group, three phenyl rings and a methanol molecule. The axial sites are occupied by the O atoms of the methanol molecule and the carboxylate group, while the equatorial plane is formed by the C atoms of three phenyl rings. The benzene ring of the 2chloro-4-nitrobenzoate ligand makes dihedral angles of 66.18 (7), 74.71 (7) and 77.39 (7) with respect to the three phenyl rings. In the crystal, the molecules are linked via intermolecular O-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds into a column along the b axis.

Related literature
For general background to and the coordination environment of the title complex, see: Yeap & Teoh (2003); Szorcsik et al. (2006);Á lvarez-Boo et al. (2006). For the stability of the temperature controller used in the data collection, see : Cosier & Glazer (1986). For bond-length data, see: Allen et al. (1987).

Refinement
H1O3 was located in a difference Fourier map and allowed to refined freely. The remaining H atoms were positioned geometrically and refined using a riding model with C-H = 0.93 or 0.96 Å and U iso (H) = 1.2 or 1.5 U eq (C). A rotating-group model was applied for the methyl group. The highest residual electron density peak and the deepest hole are located at 0.57 and 0.53 Å, respectively, from atom Sn1. Fig. 1. The molecular structure of the title compound, showing 50% probability displacement ellipsoids for non-H atoms.

Special details
Experimental. The crystal was placed in the cold stream of an Oxford Cyrosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K.
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.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.