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Divalent E(0) Compounds (E=Si–Sn)

机译:二价E(0)化合物(E = Si – Sono)

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Quantum-chemical calculations at the BP86/TZVPP level of theory have been carried out for compounds EL2 for E=Si, Ge, Sn, where L is a five-membered cyclic ylidene or N-heterocyclic ylidene. The theoretical results provide evidence for the classification of the complexes as divalent E(0) compounds, where the bonding situation is best described in terms of donor–acceptor interactions between a bare atom E, which retains its valence electrons as two lone pairs, and two donor ligands L→E→L. The molecules are very strong donors, which may bind one or two Lewis acids. Divalent E(0) compounds have unusually high second proton affinities and they are strong s donor ligands. The calculations predict that complexes of EL2 with one or two BH3 ligands are stable enough to become isolated in a condensed phase.It is also shown that the bond dissociation energies (BDEs) of transitionmetal complexes [(CO)5WD] and [(CO)3NiD], where D=EL2 are rather high. The BDE of some ligands D are higher than those of CO in the metal carbonyls.
机译:对化合物EL2的E = Si,Ge,Sn(其中L是五元环亚烷基或N-杂环亚烷基)进行了理论上的BP86 / TZVPP量子化学计算。理论结果为将络合物分类为二价E(0)化合物提供了证据,其中键合情况最好根据裸原子E之间的供体-受体相互作用来描述,该原子将其价电子保持为两个孤对,并且两个供体配体L→E→L。分子是非常强的供体,可以结合一个或两个路易斯酸。二价E(0)化合物具有异常高的第二质子亲和力,并且它们是强大的供体配体。计算表明,EL2与一个或两个BH3配体的配合物足够稳定,可以在冷凝相中分离。还表明过渡金属配合物[(CO)5WD]和[[CO)的键解离能(BDE) 3NiD],其中D = EL2很高。在金属羰基化合物中,某些配体D的BDE高于CO的BDE。

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