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A novel triply bridged dinuclear four-coordinate copper(I) complex with sterically bulky bis(dicyclohexylphosphino)methane ligand

  • Research Article
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Central European Journal of Chemistry

Abstract

A novel triply bridged dinuclear copper(I) complex: Cu2(μ-paa)(μ-dcpm)2(BF4)2·2CH2Cl2 [ paa = pyridine-2-carbaldehyde azine (C12H10N4) and dcpm = bis(dicyclohexylphosphino)methane(C25H46P2) ] has been synthesized and structurally characterized. Crystallographic studies of the complex showed that two copper(I) ions were bridged by one paa ligand and two dcpm ligands. The paa ligand adopted the Z configuration at the partially double N-N bond and the two copper ions have distorted tetrahedral coordination geometry. Because of the steric effect of dcpm, the pyridine rings of the paa ligand are obviously not on the same plane (the dihedral angle is 43.610). The interaction between neighboring ligands results in a N-N bond length (1.374(7) Å) contraction. The UV-vis spectra of the complex exhibited intense high-energy absorptions at λmax < 340 nm and broad visible bands in a range of 380−550 nm, ascribed to intraligand (IL π-π*) transitions and metal-to-ligand charge-transfer (MLCT) transitions, respectively. Interestingly, the absorbtion peaks varied regularly with the solvent polarity. Although the complex has a rigid structure with the copper ions held firmly by triply bridged ligands, the emission and excitation spectra revealed that the complex exhibits weak fluorescence.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Yun Nan Normal University, Kun Ming, 650092, PR China

    Zu-Fu Yao, Xin Gan & Wen-Fu Fu

  2. Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing, 100101, PR China

    Wen-Fu Fu

  3. Department of Pharmacy, Huai Hua Medical College, Huai Hua, 418000, PR China

    Zu-Fu Yao

Authors
  1. Zu-Fu Yao
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  2. Xin Gan
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  3. Wen-Fu Fu
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Correspondence to Wen-Fu Fu.

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Yao, ZF., Gan, X. & Fu, WF. A novel triply bridged dinuclear four-coordinate copper(I) complex with sterically bulky bis(dicyclohexylphosphino)methane ligand. cent.eur.j.chem. 6, 613–616 (2008). https://doi.org/10.2478/s11532-008-0057-9

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  • DOI: https://doi.org/10.2478/s11532-008-0057-9

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