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Citation: HUANG Xiao-Xuan, XU Xuan. Ir-Hg Interactions and the Nature of Redox Reactions in Ir(CO)Cl_a(Ph₂Ppy)₂HgCl_b(HgCl₂)_c (a, b=1, 2|c=0, 1)[J]. Acta Physico-Chimica Sinica, ;2009, 25(07): 1362-1366. doi: 10.3866/PKU.WHXB20090721 shu

Ir-Hg Interactions and the Nature of Redox Reactions in Ir(CO)Cl_a(Ph₂Ppy)₂HgCl_b(HgCl₂)_c (a, b=1, 2|c=0, 1)

HUANG Xiao-Xuan ,
XU Xuan

1.
Key Laboratory of Electrochemical Technology on Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China

Received Date: 23 January 2009
Available Online: 30 April 2009

Structures of the mononuclear complex Ir(CO)Cl(Ph2Ppy)2(1), binuclear complexes Ir(CO)(Cl)2(Ph2Ppy)2·HgCl (2), Ir (CO)Cl (Ph2Ppy)2HgCl2 (3), and Ir (CO) (Cl)2 (HgCl2) (Ph2Ppy)2HgCl (4) were optimized using the density functional theory (DFT) PBE0 method with SDD basis sets for Ir and Hg, 6-31G* basis sets for H, C, O, and N atoms and 6-311G* basis sets for P and Cl atoms. Based on the optimized geometries of complexes 1-4, a counterpoise correction was carried out for the basis-set superposition error (BSSE) of the interaction energies. Nature bond orbital (NBO) and frontier orbital analyses were also performed for all the complexes to study the Ir-Hg interactions and the nature of the redox reactions. Our conclusions are as follows: products of the redox reactions (complexes 2 and 4) are more stable than that of the nonredox reaction (complex 3). The strength of the Ir-Hg interaction increases as follows: 3<4<2. As the strength of the Ir-Hg interaction increases, the difference between the Ir and the Hg contribution to the HOMO gradually decreases. Ir-Hg σbonding and antibonding orbitals all exist in complexes 2 and 4, and can be described as 0.5985sd0.06Hg+0.8012sd2.48Ir for complex 2 and 0.5794sd0.05Hg+0.8151sd2.48Ir for complex 4. However, in complex 3, the Ir-Hg interaction results from nIr→nHg, σIr—P(1)→nHg, and σIr—C(1)→nHg charge transfer interactions.
- DFT,
- NBO,
- Ir-Hg interaction,
- Redox,
- Stability
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Ir-Hg Interactions and the Nature of Redox Reactions in Ir(CO)Cla(Ph2Ppy)2HgClb(HgCl2)c (a, b=1, 2|c=0, 1)

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通讯作者: 陈斌, bchen63@163.com

Ir-Hg Interactions and the Nature of Redox Reactions in Ir(CO)Cl_a(Ph₂Ppy)₂HgCl_b(HgCl₂)_c (a, b=1, 2|c=0, 1)