期刊
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
卷 894, 期 1-3, 页码 88-92出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.theochem.2008.10.004
关键词
Metallocenes; Alkaline-Earth metals; Energy decomposition analysis; Metal-metal bonding
资金
- China NSF [20703008, 20671038]
- Natural Science Foundation of Jiangsu Educational Office [06KJD150031]
- Opening Project of Key Laboratory for Chemistry of Low-Dimensional Materials of Jiangsu Province [JSKC06032]
The geometries, metal-metal bond dissociation energies of Group 2 dimetallocene complexes M-2(eta(5) - C5H5)(2) (M = Be, Mg, Ca, Sr and Ba) have been calculated using density functional theory at the BP86 level with TZ2P basis sets. The nature of metal-metal bonding has been analyzed with an energy decomposition method. The results revealed that the M-M binding interactions in these nonpolar bonding alkaline-Earth metal complexes have more ionic character than covalent character, rather than the sole covalent bond. Molecular orbital calculations indicate that, for the heavier alkaline-Earth metal (Ca, Sr and Ba) compounds, substantial (n - 1)d character is found in the delta bonding between metal and cyclopentadiene (Cp) ring, while there is few delta bonding interaction between M-M bond due to longer M-M bond distance. (C) 2008 Elsevier B.V. All rights reserved.
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