Isolation of pentamethylcyclopentadienylchromium tricarbonyl dimer by two methods. X-Ray crystal structural study of two polymorphs
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The [(C5Me5)Cr(CO)3]2 dimer has been prepared by two methods, (i) oxidation of the anion [(C5Me5)Cr(CO)3]- by ferric ions in an aqueous acidic medium, and (ii) carbonylation of [(C5Me5)Cr(CO)2]2 under high CO pressure at elevated temperatures. The complex crystallises in the monoclinic system in two polymorphic forms (I and II). Crystal structure data: I: space group P21/c, a = 8.376(4), b = 19.397(6), c = 8.805(5) Å, β = 117.40(3)°, U = 1269.8 Å3, Z = 2, Dc = 1.419 g cm-3, and II: space group P21/n, a = 9.333(2), b = 8.998(1), c = 15.297(3) Å, β = 95.86(2)°, U = 1277.9(1) Å3, Z = 2, Dc = 1.37 g cm-3. © 1990.
author list (cited authors)
Goh, L. Y., Hambley, T. W., Darensbourg, D. J., & Reibenspies, J.