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Carbodiphosphorane analogues E(PPh _3) _2 with E=C-Pb: A theoretical study with implications for ligand design

机译:具有E = C-Pb的碳二膦烷类似物E(PPh _3)_2:对配体设计有影响的理论研究

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Quantum-chemical calculations at the BP86/TZVPP level have been carried out for the heavy Group 14 homologues of carbodiphosphorane E(PPh _3) _2, where E=Si, Ge, Sn, Pb, which are experimentally unknown so far. The results of the theoretical investigation suggest that the tetrelediphosphoranes E(PPh _3) _2 (1 E) are stable compounds that could become isolated in a condensed phase. The molecules possess donor-acceptor bonds Ph _3P→E←PPh _3 to a bare tetrele atom E, which retains its four valence electrons as two electron lone pairs. The analysis of the bonding situation and the calculation of the chemical reactivity indicate that the molecules 1 E belong to the class of divalent E(0) compounds (ylidones). All molecules 1 C-1 Pb have very large first but also very large second proton affinities, which distinguishes them from the N-heterocyclic carbene homologues, in which the donor atom is a divalent E(II) species that possesses only one electron lone pair. Compounds 1 E are powerful double donors that strongly bind Lewis acids such as BH _3 and AuCl in the complexes 1 E(BH _3) _n and 1 E(AuCl) _n (n=1, 2). The bond dissociation energies (BDEs) of the second BH _3 and AuCl molecules are only slightly less than the BDE of the first BH _3 and AuCl. The results of this work are a challenge for experimentalists.
机译:已经对碳二磷环烷E(PPh _3)_2的重族14同源物进行了BP86 / TZVPP水平的量子化学计算,其中E = Si,Ge,Sn,Pb到目前为止尚不清楚。理论研究的结果表明,四萜二膦E(PPh _3)_2(1 E)是稳定的化合物,可以在缩合相中分离出来。分子具有与裸露的四原子E的供体-受体键Ph _3P→E←PPh _3,该原子保留其四个价电子为两个电子孤对。对键合情况的分析和化学反应性的计算表明,分子1 E属于二价E(0)化合物(乙叉基)的类别。所有分子1 C-1 Pb的第一质子亲和力都非常大,第二质子亲和力也非常大,这与N杂环卡宾同系物不同,其中供体原子是仅具有一个电子孤对的二价E(II)物种。 。化合物1 E是强大的双供体,可与结合物1 E(BH _3)_n和1 E(AuCl)_n(n = 1,2)中的路易斯酸(如BH _3和AuCl)牢固结合。第二BH _3和AuCl分子的键解离能(BDE)仅略小于第一BH _3和AuCl的BDE。这项工作的结果对实验者是一个挑战。

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