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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Neutral Hexacoordinate Mixed Trichelate Silicon Complexes, Structure and Stereodynamics
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Neutral Hexacoordinate Mixed Trichelate Silicon Complexes, Structure and Stereodynamics

机译:中性六配位混合三螯合物硅配合物,结构和立体动力学

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摘要

Neutral hexacoordinate silicon trichelates have been synthesized by transsilylation, using two approaches: (i) The reaction of a dichloro-monocyclic silane [2,5-diphenyl-2,5-diazasilolidine] with two mol-equivalents of O-(trimethylsilyl)imidates. (ii) A dichloro-dichelate reacted with one mol-equivalent of the trimethylsilyl bidentate ligand precursor, bis(trimethylsilyl)benzhydroximic acid imidate. The former group Of complexes underwent inversion of configuration observed by the temperature dependence of the H-1 NMR spectra and coalescence of signals due to diastereotopic N-methyl- and CH2 groups, presumably by exchange of hydrazido chelate rings through a bicapped tetrahedral intermediate or transition state. The activation free energies range between 13.8 and 14.7 kcal.mol(-1). Similar exchange in the hydroxamic acid derived complexes was not observed, because Of Much shorter and stronger dative N-Si bonds.
机译:已使用两种方法通过硅烷化反应合成了中性六配位硅三螯合物:(i)二氯单环硅烷[2,5-二苯基-2,5-二氮杂硅烷基]与两个摩尔当量的O-(三甲基甲硅烷基)亚氨酸酯反应。 (ii)二氯-二癸酸酯与一摩尔当量的三甲基甲硅烷基二齿配体前体双(三甲基甲硅烷基)苯氢肟酸亚氨酸酯反应。前一组配合物通过H-1 NMR谱图的温度依赖性和非对映体N-甲基和CH2基团引起的信号聚结而观察到构型反转,大概是通过肼基螯合环通过二键的四面体中间或过渡位进行交换州。活化自由能在13.8至14.7 kcal.mol(-1)之间。在异羟肟酸衍生的络合物中未观察到类似的交换,因为更长的和更长的固定N-Si键。

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