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 characterization revealed that each Ag center is supported primarily by two N centers in approximate co-linear geometry. Secondary coordination of ethereal O center to Ag was also observed in molecule 1. Conformational isomerism exists in the crystal of 2, and is attributed to the low energy-barrier free rotation of aryls. Crystal data: compound 1 crystallizes in orthorhombic space group Pbca, a=11.392(1), b=15.007(1), c=19.363(2) Å, Z=4; compound 2 crystallizes in tetragonal space group P42/n, a=24.152(2), c=14.371(2) Å, Z=8.