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Abstract：
Di-μ-hydroxido-bis-[di-bromido-(di-methyl-formamide-κO)ethyl-tin(IV)], [Sn2Br4(C2H5)2(OH)2(C3H7NO)2], was prepared from ethyl-tin(IV) bromide and N,N-di-methyl-formamide (DMF) in air. The crystal structure exhibits the typical structural features of dimeric Lewis-base-stabilized monoorganotin(IV)-dihalide-hydroxides, RSnHal2(OH), i.e. two octa-hedrally coordinated Sn atoms are linked together via two bridging hydroxide groups, resulting in a centrosymmetric four-membered rhomboid-like Sn-OH ring with acute angles at the Sn atom, obtuse angles at the O atoms and two different tin-oxygen bond lengths. With the shorter bond trans to the ethyl group, this observation underlines once more the so-called trans-strengthening effect in monoorganotin(IV) com-pounds with octa-hedrally coordinated Sn atoms. Differences and similarities in the bond lengths and angles in the four-membered Sn-OH rings have been worked out for the rings in dimeric diorganotin(IV)-halide-hydroxides, [R 2SnHal(OH)]2, and hydrates of dimeric tin(IV)-trihalide-hydroxide-aqua-hydrates, [SnHal3(OH)(H2O)]2·nH2O.
摘要：
二-μ-羟基-双-[二-溴代-(二-甲基-甲酰胺-κO)乙基-锡(IV)]，[Sn2Br4(C2H5)2(OH)2(C3H7NO)2],由乙基锡(IV)溴化物和N,在空气中的N-二甲基甲酰胺(DMF)。晶体结构表现出二聚体路易斯碱稳定的单有机锡（IV）-二卤化物氢氧化物的典型结构特征，RSnHal2(OH),即两个八面体配位的Sn原子通过两个桥接羟基连接在一起，产生中心对称的四元菱形Sn-OH环，在Sn原子处具有锐角，O原子处的钝角和两个不同的锡-氧键长度。随着较短的键反式乙基，这一观察结果再次强调了具有八面体配位Sn原子的单有机锡（IV）化合物中所谓的反式增强作用。对于二聚二有机锡（IV）-卤化物-氢氧化物中的环，已经确定了四元Sn-OH环的键长和角度的差异和相似性，[R2SnHal（OH）]2和二聚锡（IV）-三卤化物-氢氧化物-水水合物的水合物，[SnHal3(OH)(H2O)]2·nH2O.
