Citation:
CAO Fei, TAN Kai, LIN Meng-Hai. Geometric and Electronic Structures of Hexanuclear Binary Ta/Rh Mixed Clusters[J]. Acta Physico-Chimica Sinica,
;2010, 26(11): 3061-3066.
doi:
10.3866/PKU.WHXB20101112
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Density functional theory (DFT) was employed to investigate the geometric and electronic properties of a series of hexanuclear binary Ta/Rh clusters. The results show that most of the stable structures of the Ta/Rh mixed clusters have low symmetry and belong to the C1 or Cs point groups while the [Ta2Rh4Cl4H8(CN)6]4- clusters are highly symmetric (C2h or C4v). The energy gaps (△EH-L) between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the mixed clusters are narrow and within 0.52-1.00 eV. A frontier orbital analysis of the mixed clusters clearly shows that the molecular orbitals are mainly composed of the d-orbitals of the skeleton metal atoms. When more rhodium atoms are substituted for tantalum atoms, the Ta—Rh bond has a greater influence on the stable structures of the mixed clusters and the influence of Ta—Ta bond decreases while the Rh—Rh bond has a non-bonding or anti-bonding nature.
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