Metal π-complexes of cyclooctatetraenes: II. Crystal and molecular structure of bis(1-2:5-6-η-cyclooctatetraene)silver(I) nitrate, (C 8H 8) 2AgNO 3

Abstract

X-ray analysis showed that the 2:1 adduct of cyclooctatetraene and silver nitrate exists as discrete (C 8H 8) 2AgNO 3 molecules in the crystalline state. Each molecule has C 2 symmetry, with the Ag 1 ion coordinated by a symmetrical bidentate nitrato group and four double bonds, two from each cyclooctatetraene moiety in an unsymmetrical mode. This overcrowded coordination geometry leads to significantly weaker metal-ligand interactions than in the previously studied 1:1 adduct and related cyclic oligoolefin-silver(I) complexes. Crystals are monoclinic, space group C2/ c, with a = 10.296(2), b = 9.752(1), c = 15.122(4) →, β = 95.59(2)°, and Z = 4. The structure was refined anisotropically to R = 0.035 for 1395 Mo- K α data.