Bonding in diborane-metal complexes: a quantum-chemical and experimental study of complexes featuring early and late transition metals.
Bonding in diborane-metal complexes: a quantum-chemical and experimental study of complexes featuring early and late transition metals.
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乙硼烷-金属配合物中的键合:早期和晚期过渡金属配合物的量子化学和实验研究
DOI:
10.1002/chem.201300348
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
H.-J. Himmel
中科院分区:
文献类型:
--
作者:
A. Wagner;E. Kaifer;H.-J. Himmel
The coordination chemistry of the doubly base‐stabilised diborane(4), [HB(hpp)]2(hpp=1,3,4,6,7,8‐hexahydro‐2H‐pyrimido‐[1,2‐a]pyrimidinate), was extended by the synthesis of new late transition‐metal complexes containing CuIand RhIfragments. A detailed experimental study was conducted and quantum‐chemical calculations on the metal–ligand bonding interactions for [HB(hpp)]2complexes of Group 6, 9, 11 and 12 metals revealed the dominant BHM interactions in the case of early transition‐metal fragments, whereas the BBM bonding prevails in the case of the late d‐block compounds. These findings support the experimental results as reflected by the IR and NMR spectroscopic parameters of the investigated compounds. DFT calculations on [MeB(hpp)]2and model reactions between [B2H4⋅2NMe3] and [Rh(μ‐Cl)(C2H4)2] showed that the bicyclic guanidinate allows in principle for an oxidative addition of the BB bond. However, the formation of σ‐complexes is thermodynamically favoured. The results point to the selective BH or BB bond‐activation of diborane compounds by complexation, depending on the chosen transition‐metal fragment.
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DOI:
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