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Is it True That the Normal Valence-Length Correlation Is Irrelevant for Metal-Metal Bonds?

机译:金属价键的正常价态-长度相关性是真的吗?

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The most intriguing feature of metal-metal bonds in inorganic compounds is an apparent lack of correlation between the bond order and the bond length. In this study, we combine a variety of literature data obtained by quantum chemistry and our results based on the empirical bond valence model (BVM), to confirm for the first time the existence of a normal exponential correlation between the effective bond order (EBO) and the length of the metal-metal bonds. The difference between the EBO and the formal bond order is attributed to steric conflict between the (TM)(n) cluster (TM=transition metal) and its environment. This conflict, affected mainly by structural type, should cause high lattice strains, but electron redistribution around TM atoms, evident from the BVM calculations, results in a full or partial strain relaxation.
机译:无机化合物中金属-金属键最吸引人的特征是键序与键长之间显然缺乏相关性。在这项研究中,我们结合了通过量子化学获得的各种文献数据以及基于经验键价模型(BVM)的结果,首次确认了有效键序(EBO)之间存在正常指数相关性和金属-金属键的长度。 EBO和正式键合顺序之间的差异归因于(TM)(n)团簇(TM =过渡金属)与周围环境之间的空间冲突。这种冲突主要受结构类型的影响,应引起较高的晶格应变,但从BVM计算可以明显看出,TM原子周围的电子重新分布会导致全部或部分应变松弛。

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