SYNTHESIS, PROPERTIES AND CRYSTAL-STRUCTURES OF DICOPPER(I) AND DISILVER(I) COMPLEXES WITH 1,8-NAPHTHYRIDINE (NAPY) - [CU2(NAPY)2](CLO4)2 AND [AG2(NAPY)2](CLO4)2

Binuclear copper(I) and binuclear silver(I) complexes with 1,8-naphthyridine (napy) have been prepared. The crystal structures of [Cu2(napy)2](ClO4)2 (1) and [Ag2(napy)2](ClO4)2 (2) have been determined by using single crystal X-ray diffraction methods. Compound 1 crystallizes in space group P1, with a = 8.245(2), b = 10.376(2), c = 5.886(1) Å, α = 84.06(2), β = 98.73(2), γ = 108.53(2)o and Z = 1; R = 0.047 for 1247 reflections. The cation of 1, [Cu2(napy)2]2+, is binuclear with two napy ligands bridging the two metals. The geometry of each Cu atom is nearly linear. Compound 1, having a short Cu···Cu distance of 2.506(2) Å, reversibly reacts with CO, acetylene and ethylene. Crystals of 2 are monoclinic space group P21/n with a = 16.017(7), b = 10.427(4), c = 5.752(2) Å, β = 99.90(3)o and Z = 2; R = 0.088 for 1321 reflections. The structure of 2 is essentially the same as that of 1. The Ag···Ag distance of 2.748(2) Å is short compared with the corresponding distance in metallic silver 2.88 Å. © 1990.