{[Ag₂ (μ-dppm)₂ (μ-TCNQ)₂](TCNQ)}, a charge transfer compound derived from a donor with a metal–metal bond

Abstract

Reaction of AgNO3, dppm (bis(diphenylphosphino)methane), and TCNQ in molar ratio of 1 : 1 : 1 produced an acceptor–donor silver compound {[Ag₂(dppm)₂ (µ-TCNQ)₂](TCNQ)}, 1. In the structure, determined by X-ray crystallography, two silver atoms are triply-bridged by two dppm ligands and metal–metal bond to form a dimer; the distance between two Ag is 3.1753(8) Å. Compound 1 was studied by IR and UV/Vis/NIR spectroscopy, exhibiting an intervalence transfer transition at λ = 1286 nm, and also is photoluminescent (λ_max = 537 and 654 nm) at room temperature.

Keywords:

• Silver dimer
• Charge transfer
• Luminescence

Acknowledgments

This work was supported by the Research Foundation for Returned Chinese Scholars Overseas of Chinese Education Ministry (No. B7050170). We also thank the South China University of Technology for financial support.