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Journal of Molecular Modeling

, Volume 18, Issue 6, pp 2387–2398 | Cite as

Are formal oxidation states above one viable in cyclopentadienylcopper cyanides?

  • Congzhi Wang
  • Xiuhui Zhang
  • Qian-shu Li
  • Yaoming Xie
  • R. Bruce King
  • Henry F. SchaeferIII
Original Paper

Abstract

Recent experiments have led to the discovery of the thermally unstable organocopper compounds (η3-C3H5)CuMe2, [(η3-C3H5)CuMe3], and CuMe 4 in which the copper atom is in the +3 formal oxidation state. In a quest for more stable organocopper compounds with copper in formal oxidation states above one, the binuclear cyclopentadienylcopper cyanides Cp2Cu2(CN) n (Cp = η5-C5H5; n = 1, 2, 3) have been studied using density functional theory (DFT). The lowest energy structures are found to have terminal Cp rings and bridging cyanide ligands up to a maximum of two bridges. Higher-energy Cp2Cu2(CN) n (n = 1, 2, 3) structures are found with bridging Cp rings. The Cp2Cu2(CN)3 derivatives, with the copper atoms in an average +2.5 oxidation state, are clearly thermodynamically disfavored with respect to cyanogen loss. However, Cp2Cu2(CN)2 and Cp2Cu2(CN), with the copper atoms in the average oxidation states +1.5 and +2, respectively, are predicted to have marginal viability. The prospects for the copper(II) derivative Cp2Cu2(CN)2 contrast with that of the “simple” Cu(CN)2, which is shown both experimentally and theoretically to be unstable with respect to cyanogen loss to give CuCN.

Figure

Cp2Cu2(CN),Cp2Cu2(CN) 2 , Cp2Cu2(CN) 3

Keywords

Copper Cyclopentadienylcopper cyanide Oxidation states Density functional theory 

Notes

Acknowledgments

We are indebted to the Chinese National Natural Science Foundation (20903010 and 20873045), Research Fund for the Doctoral Program of Higher Education (200800071019), China Postdoctoral Science Foundation funded project in China as well as the U. S. National Science Foundation (Grants CHE-1054286 and CHE-0716718) for support of this research.

Supplementary material

894_2011_1251_MOESM1_ESM.doc (820 kb)
ESM 1 (DOC 820 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Key Laboratory of Cluster Science, Ministry of Education of China, Department of ChemistryBeijing Institute of TechnologyBeijingPeoples Republic of China
  2. 2.Institute of Chemical PhysicsBeijing Institute of TechnologyBeijingPeoples Republic of China
  3. 3.Center for Computational Quantum Chemistry, School of Chemistry and EnvironmentSouth China Normal UniversityGuangzhouPeoples Republic of China
  4. 4.Department of Chemistry and Center for Computational ChemistryUniversity of GeorgiaAthensUSA

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