U. Geiser et Am. Kini, STRUCTURE OF THE TRIGONAL PHASE OF BIS(METHINYLTRICOBALTENNEACARBONYL), [CCO3(CO)9]2, Acta crystallographica. Section C, Crystal structure communications, 49, 1993, pp. 1322-1324
A second, trigonal, phase of [CCo3(CO)9]2, ppa3C1;4:5:6kappa3C2-hexaki
s(tricarbonylcobalt)-(6 Co-Co), has been found, in addition to the mon
oclinic one reported earlier [Brice & Penfold (1972). Inorg. Chem. 11,
1381-1384]. The intermolecular geometry of the molecule in the two cr
ystallographic modifications is virtually the same. The two Co3 triang
les are twisted by ca 28-degrees with respect to each other, indicatin
g a conformation between staggered and eclipsed. Optically active crys
tals of the trigonal phase form by spontaneous resolution of the enant
iomorphic conformers.