Two Dinuclear CuII–Tetrazolate Complexes: Syntheses, Structures, and Magnetic Properties

Wei-Chao Song; Jian-Rong Li; E. Carolina Sañudo; Jia Liu; Xian-He Bu

doi:10.1071/CH08477

RESEARCH ARTICLE

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Two Dinuclear Cu^II–Tetrazolate Complexes: Syntheses, Structures, and Magnetic Properties

Wei-Chao Song ^A , Jian-Rong Li ^A , E. Carolina Sañudo ^B , Jia Liu ^A and Xian-He Bu ^A ^C

+ Author Affiliations

- Author Affiliations

^A Department of Chemistry, Nankai University, Tianjin 300071, China.

^B Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, 08028 Barcelona, Spain.

^C Corresponding author. Email: buxh@nankai.edu.cn

Australian Journal of Chemistry 62(8) 941-946 https://doi.org/10.1071/CH08477
Submitted: 2 November 2008 Accepted: 20 April 2009 Published: 13 August 2009

Abstract

Two μ₂-tetrazolyl bridged dinuclear Cu^II complexes, [Cu(L¹)(N₃)(phen)]₂ 1 (HL¹ = 5-phenyltetrazole, phen = 1,10-phenanthroline) and [Cu(L²)₂(NH₃)₂]₂ 2 (HL² = 5-(2-methylphenyl)-1H-tetrazole), were synthesized and characterized by X-ray single crystal diffraction and IR spectroscopy. The two complexes are dinuclear Cu^II entities, in which the Cu^II centres are linked by tetrazolate bridging ligands. However, the Cu^II ions of the two complexes show different coordination geometries, square pyramidal for complex 1 and trigonal-bipyramidal for complex 2, which may lead to different magnetic properties. In complex 1, a weak ferromagnetic coupling was found to exist between Cu^II ions, but in complex 2, weak antiferromagnetic coupling was found to be present. A van Vleck equation for the Cu^II dimer was written using the Ĥ = –2J[Ŝ₁Ŝ₂] Hamiltonian, and it was used to fit the experimental data with fitting parameters J = 0.26 cm^–1 and g = 2.17 for complex 1, J = –2.34 cm^–1 and g = 2.17 for complex 2, respectively.

Acknowledgements

We are grateful for financial support from the NNSF of China (Nos 20531040 and 50673043), NSF of Tianjin, China (07JCZDJC00500), and the Spanish Government (Grant CTQ2006/03949BQU and Juan Ramón y Cajal fellowship, E.C.S.).

References

Two Dinuclear CuII–Tetrazolate Complexes: Syntheses, Structures, and Magnetic Properties

Abstract

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Two Dinuclear Cu^II–Tetrazolate Complexes: Syntheses, Structures, and Magnetic Properties