Danish Muhammad, Ghafoor Sabiha, Tahir M Nawaz, Ahmad Nazir, Hamid Masood
Acta Crystallogr Sect E Struct Rep Online. 2010 Sep 18;66(Pt 10):m1268-9. doi: 10.1107/S1600536810036512.
The title compound, [Sn(4)(CH(3))(8)(C(8)H(7)O(2))(4)O(2)], is a distann-oxane derivative of 2-methyl-benzoic acid. The crystal structure is composed of centrosymmetric dimers lying about inversion centres. Both independent Sn atoms adopt distorted trigonal-bipyramidal SnC(2)O(3) coordination geometries with the basal planes consisting of two C-atoms from the methyl groups and a bridging O atom. The Sn-C and Sn-O bond lengths lie in the ranges 2.090 (2)-2.104 (3) and 2.0241 (14)-2.2561 (15) Å, respectively. The central four-membered planar Sn(2)O(2) ring [Sn⋯Sn distance = 3.2993 (2) Å] makes dihedral angles of 5.43 (11) and 59.50 (7)° with the methyl-phenyl groups, which are themselves oriented at a dihedral angle of 61.38 (8)°. Besides weak C-H⋯O and C-H⋯π inter-actions, the packing mainly features van der Waals forces between the mol-ecules.
标题化合物[Sn₄(CH₃)₈(C₈H₇O₂)₄O₂]是2-甲基苯甲酸的二锡氧烷衍生物。晶体结构由位于对称中心的中心对称二聚体组成。两个独立的Sn原子均采用扭曲的三角双锥SnC₂O₃配位几何构型，其基面由来自甲基的两个C原子和一个桥连O原子组成。Sn-C键长和Sn-O键长分别在2.090 (2)-2.104 (3) Å和2.0241 (14)-2.2561 (15) Å范围内。中心的平面四元Sn₂O₂环[Sn⋯Sn距离 = 3.2993 (2) Å]与甲基苯基的二面角分别为5.43 (11)°和59.50 (7)°，而甲基苯基自身的二面角为61.38 (8)°。除了弱的C-H⋯O和C-H⋯π相互作用外，堆积主要特征是分子间的范德华力。
