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Silver(I), whose coordination number ranging from 2 to 4, displays a wide diversity in its structural chemistry. Many silver complexes containing silver halides and neutral ligands formulated as (AgX)mLn are well known, which exist in different molecular ratios, even for the same X and L, and show rather different crystal structures. For example, there are five kinds of structures of (AgX)mLn (X = Br, L = PPh3). As in the case of the series of (AgX)m(dppm)n 2 (dppm = bis(diphenylphosphino)methane), they also show very interesting structures. Interest in the coordination chemistry of silver-phosphorus complexes has arisen in part from their important applications as potential antitumor, free radical scavengers and catalyzer in industrial processes since the late middle of last century. By exclusion of all traces of oxygen, a new tetranuclear silver(I) complex containing dppm ligand has been synthesized and isolated, in which the metal atoms are bridged by dppm and I− anions. The synthesis, X-ray crystal structure and photophysical properties of the complex are reported.

Synthesis, Crystal Structure and Optical Studies of a Tetranuclear Silver(I) Complex with Bis(diphenylphosphino)methane