光谱学与光谱分析 |
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TDHF Study of Electronic Absorption Spectrum of (μ-L1)(μ-L2)-Decacarbonyl Triosmium |
ZENG Rong-ying1,TANG Wen-qing1,KUANG Dai-zhi1,CHEN Zhi-min1,LU Song2,YI Xiang-hui2 |
1. Department of Chemistry Materials Science,Hengyang Normal University,Hengyang 421008,China 2. Department of Chemistry Guangxi Normal University,Guilin 541004,China |
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Abstract Ab initio method was used to optimize the molecular geometry for a series of clusters (μ-L1)(μ-L2)- decacarbonyltriosmium[L1,L2=H,Cl,Br,I] at HF/CEP-4G level. The related chemical properties of clusters,in particular,the regularities of the bridge halogen effects on spectroscopic properties and bonding properties were discussed. The calculation results of the frontier molecular orbital showed that M—M bonds were mainly composed of s and d atomic orbitals. From Cl to I,with the atom number of bridge ligand increasing,HOMO and NHOMO orbitals on the Os3(CO)10(μ-L)2 clusters and HOMO on the Os3(CO)10(μ-H)(μ-L) clusters become higher,while ΔεL-H and ΔεL-NH energies become lower,so the authors predicted that the electronic absorption bands of clusters are shifted to infrared region. Excited states of clusters calculated with TDHF show that the transition of cluster Os3(CO)10(μ-H)2(I) is mainly π→σ* and σ→σ*,while the electronic absorption of other clusters Os3(CO)10(μ-H)(μ-L) [L=Cl,Br,I] and Os3(CO)10(μ-L)2[L=Cl,Br] is mainly from σ→σ* transition. From Cl to I,with the atom number of bridge ligand increasing,the electronic absorption band of cluster is shifted to infrared region,and also the absorption becomes weaker.
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Received: 2006-03-06
Accepted: 2006-05-18
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Corresponding Authors:
ZENG Rong-ying
E-mail: zengrongying2003@yahoo.com.cn
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Cite this article: |
ZENG Rong-ying,TANG Wen-qing,KUANG Dai-zhi, et al. TDHF Study of Electronic Absorption Spectrum of (μ-L1)(μ-L2)-Decacarbonyl Triosmium[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(07): 1271-1275.
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URL: |
https://www.gpxygpfx.com/EN/Y2007/V27/I07/1271 |
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