Synthesis and crystallographic characterization of dinuclear silver complexes supported by N,N '-diarylformamidinates

Synthesis of two new disilver(I) complexes of diarylformamidinate bearing o -ethoxy (1) and m-butoxy substituents (2) is described. Crystallographic ch aracterization revealed that each Ag center is supported primarily by two N centers in approximate co-linear geometry. Secondary coordination of ether eal 0 center to Ag was also observed in molecule 1. Conformational isomeris m exists in the crystal of 2, and is attributed to the low energy-barrier f ree rotation of aryls. Crystal data: compound I crystallizes in orthorhombi c space group Pbca, a = 11. 392(1), b = 15.007(1), c = 19.363(2) Angstrom, Z = 4; compound 2 crystallizes in tetragonal space group P4(2)/n, a = 24.15 2(2), c = 14.371(2) Angstrom, Z = 8. (C) 2001 Elsevier Science B.V. All rig hts reserved.