Synthesis, Characterization and Photophysical Properties of Novel Dinuclear Silver( I ) and Mononuclear Palladium( II ) Complexes with 1,2‐Bis[(anthracen‐9‐ylmethyl)amino]ethane

Silver( I ) ( 3 ) and palladium( II ) ( 4 ) complexes of 1,2‐bis[(anthracen‐9‐ylmethyl)amino]ethane have been synthesized and structurally characterized. X‐ray crystal structure analysis reveals that compound 3 exists as a dinuclear tris(ligand) complex with formula [Ag 2 ( 2 ) 3 ] · 2NO 3 , in which each silver center is three‐coordinate to form a slightly distorted planar‐trigonal geometry with three nitrogen donors originating from two distinct ligands. Compound 4 , on the other hand, is a mononuclear bis(ligand) complex with formula [Pd( 2 ) 2 ] · 2OAc, in which the palladium center is four‐coordinate with four nitrogen donors originating from two distinct ligands to form a square‐planar geometry. In crystals of both 3 and 4 strong intermolecular edge‐to‐face C–H ··· π packing interactions are observed, which contribute to stabilize the crystalline solid. Studies of the photophysical properties of these compounds ( 3 , 4 , and ligand 2 ) show apparent fluorescence quenching effect by introduction of metal ions and likely “excimer” emission of anthracene in the crystalline solid. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)