Citation: LIU Yu-Ning, LIU Zi-Zhong, LI Wei-Qi, LIU Dong-Sheng, GE Xiang-Wei. Structures and Aromaticities of Complexes (1,3,5-C3P3H3)M and (1,3,5-C3P3H3)2M (M=Ti, V, Cr)[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2282-2290. doi: 10.3866/PKU.WHXB20111012
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The equilibrium geometries, binding energies and aromaticities of (1,3,5-C3P3H3)M and (1,3, 5-C3P3H3)2M (M=Ti, V, Cr) were calculated by density function theory. The results indicate that the ground states of (1,3,5-C3P3H3)M and (1,3,5-C3P3H3)2M have C3v and D3h symmetries, respectively. The main interactions between the ligands and metal are covalent interactions featuring three types of interactions represented as σ, π and δ between the ligands and the metal. The dissociation method of the ligands and the metal in sandwich V complexes is different from that of Ti and Cr complexes, i.e., the former consists of two steps and the latter consists of one step. The first dissociation energy of (1,3,5-C3P3H3)2Cr is the largest and so it is the most stable one. These complexes have central, inner and outer aromaticities and the central-aromaticities of the complexes are stronger than that of (1,3,5-C3P3H3). The contributions of aromaticities is dominated by π bonds and the lone pair electronics of the metal atom. The inner-aromaticities of the complexes increase in the following order: Ti, V, Cr, and they are evidently stronger than the outer-aromaticities. Compared with (1,3,5-C3P3H3)Ti (C3v, 1A1) the distortion of the ligands for the high spin multiplicity of half-sandwich (1,3,5-C3P3H3)Ti (C3, 5A1) is larger and more stable. The central and inner aromaticities in the C plane of the high spin multiplicity half-sandwich (1,3,5-C3P3H3)Ti (C3, 5A1) are stronger than that of (1,3,5-C3P3H3)Ti (C3v, 1A1), but the central aromaticity in the P plane is weaker.
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Keywords:
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Density functional theory
, - Sandwich complex,
- Structure,
- Aromaticity
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