s-trans-diene complexes of a first-row transition metal. Half-sandwich s-trans-eta(4)-1,3-diene nitrosyl complexes of chromium

摘要

The first s-trans-1,3-diene complexes of a first-row transition metal have been prepared and characterized both in solution and in the solid state. The unexpected s-trans configuration was obtained from photolytic decarbonylation of Cp'Cr-(NO)(CO)(2) (Cp' = eta(5)-C5H5 and eta(5)-C5Me5) in the presence of conjugated dienes. Related eta(2)-olefin and eta(2)-2-alkyne complexes have also been prepared.