Eclipsed cofacial dimers of metal complexes containing d7–d7 and d8–d8 metal bonds. Crystal structure of bis[bis{(phenanthrene-9,10-diamin)ylato}cobalt(II)] and bis[{(2,3-dicyanoethenediamin)ylato}dicarbonylrhodium(I)]

Abstract

Two novel crystal structures containing the eclipsed conformation of diaminylato type ligands and metal–metal bonds are described; bis[bis{(phenanthrene-9,10-diamin)ylato}cobalt(II)] contains a Co^II–Co^II bond [2.689(1)Å] and two δ bonds between two pairs of parallel (phenanthrene-9,10-diamin)ylato ligands and bis[{(2,3-dicyanoethenediamin)ylato}dicarbonylrhodium(I)] contains a Rh^I–Rh^I bond [2.833(2)Å] and one δ bond between a pair of parallel (2,3-dicyanoethenediamin)ylato ligands.