首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Polyhedral metallaheteroborane chemistry. Synthesis, spectroscopy, structure and dynamics of eleven-vertex {RhNB9} and {PtCB9} metallaheteroboranes.
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Polyhedral metallaheteroborane chemistry. Synthesis, spectroscopy, structure and dynamics of eleven-vertex {RhNB9} and {PtCB9} metallaheteroboranes.

机译:多面体金属杂硼烷化学。十一顶点{RhNB9}和{PtCB9}金属异杂戊二烯的合成,光谱学,结构和动力学。

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摘要

Reaction between [RhCl(PPh3)(3)] and the [nido-6-NB9H11](-) anion in CH2Cl2 yields orange eleven-vertex [8,8-(PPh3)(2)-nido-8,7-RhNB9H11] (1). Reaction of the [nido-6-CB9H12](-) anion with [cis-PtCl2(PMe2Ph)(2)] in methanol affords yellow eleven-vertex [9-(OMe)-8,8-(PMe2Ph)(2)-nido-8,7-PtCB9H10] (2), which is also formed from the reaction of MeOH with [8,8-( PPh3)(2)-nido-8,7-PtCB9H10] (3). Both compounds have been characterised by single-crystal X-ray diffraction analysis and examined by NMR spectroscopy and have structures based on eleven-vertex nido-type geometries, with the metal centre and the heteroatoms in the adjacent (8)- and (7)-positions on the pentagonal open face. The metal-to-heteroborane bonding sphere of 1 is fluxional, with a Delta G(double dagger) value of 48.4 kJ mol(-1). DFT calculations on the model compounds [8,8-(PH3)(2)-nido-8,7-RhNB9H11] (1a) and [8,8-(PH3)(2)-nido-8,7-RhSB9H10] (4a) have been carried out to define the fluxional process and the intermediates involved.
机译:[RhCl(PPh3)(3)]和[nido-6-NB9H11](-)阴离子在CH2Cl2中的反应产生橙色的十一顶点[8,8-(PPh3)(2)-nido-8,7-RhNB9H11 ](1)。 [nido-6-CB9H12](-)阴离子与[cis-PtCl2(PMe2Ph)(2)]在甲醇中的反应产生黄色的十一顶点[9-(OMe)-8,8-(PMe2Ph)(2) -nido-8,7-PtCB9H10](2),也由MeOH与[8,8-(PPh3)(2)-nido-8,7-PtCB9H10](3)反应形成。两种化合物均已通过单晶X射线衍射分析进行了表征,并通过NMR光谱进行了检查,并具有基于11个顶点nido型几何结构的结构,金属中心和杂原子位于相邻的(8)-和(7)中在五边形开放面上的位置。 1的金属-杂硼烷键合球是通量的,ΔG(双匕首)值为48.4 kJ mol(-1)。对模型化合物[8,8-(PH3)(2)-nido-8,7-RhNB9H11](1a)和[8,8-(PH3)(2)-nido-8,7-RhSB9H10]进行DFT计算(4a)已被用来定义通量过程和所涉及的中间体。

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