Win Yip Foo, Teoh Siang Guan, Ha Sie Tiong, Kia Reza, Fun Hoong-Kun
Acta Crystallogr Sect E Struct Rep Online. 2008 Nov 20;64(Pt 12):m1572-3. doi: 10.1107/S1600536808037513.
In the centrosymmetric tetra-nuclear title complex, [Sn(4)(C(4)H(9))(8)(C(3)H(3)Br(2)O(2))(4)O(2)], one of the two independent Sn atoms is five-coordinated by one O atom of the carboxyl-ate anion, two bridging O atoms and two n-butyl groups in a C(2)SnO(3) distorted trigonal bipyramidal geometry. The other Sn atom also has a distorted trigonal bipyramidal geometry, being coordinated by two O atoms of two carboxyl-ate anions, one bridging O atom and two butyl groups. An inter-esting feature of the crystal structure is the short Sn⋯O [2.756 (4) Å] and O⋯O [2.608 (3) Å] inter-actions. The -BrCH(2)-CHBr- segments of the two carboxyl-ate anions are disordered over two positions [site occupancies of 0.60 (1)/0.40 (1) and 0.53 (2)/0.47 (2)]. Weak non-directional C-H⋯O inter-actions lead to the formation of infinte chains along the a axis; other weak inter-molecular C-H⋯π inter-actions are also present.
在中心对称的四核标题配合物[Sn₄(C₄H₉)₈(C₃H₃Br₂O₂)₄O₂]中，两个独立的Sn原子之一通过羧酸根阴离子的一个O原子、两个桥连O原子和两个正丁基以C₂SnO₃扭曲三角双锥几何构型进行五配位。另一个Sn原子也具有扭曲的三角双锥几何构型，由两个羧酸根阴离子的两个O原子、一个桥连O原子和两个丁基配位。晶体结构的一个有趣特征是短的Sn⋯O [2.756 (4) Å]和O⋯O [2.608 (3) Å]相互作用。两个羧酸根阴离子的 -BrCH₂-CHBr- 片段在两个位置上无序 [占位比为0.60 (1)/0.40 (1) 和0.53 (2)/0.47 (2)]。弱的非定向C-H⋯O相互作用导致沿a轴形成无限长链；还存在其他弱的分子间C-H⋯π相互作用。
