Carbonyl complexes of 1,2,4-triazoles : II. The crystal structure of pentacarbonyl-4-methyl-1,2,4-triazolechromium(0), Cr(CO) 5(C 3H 3H 5). Chromium-to-triazole π-bonding

Abstract

The crystal structure of pentacarbonyl-4-methyl-1,2,4-triazolechromium [Cr(CO) 5(C 3N 3H 5)] has been determined by single-crystal X-ray techniques. The compound crystallizes in the space group Pbca with a 10.899(2), b 17.572(2), c 11.877(2) Å and Z = 8. The compound consists of monomeric units in which the chromium atom is coordinated octahedrally to five CO groups and one monodentate coordinating 4-methyl-1,2,4-triazole ligand (CrN 2.111(2) Å). Full matrix least-squares refinement resulted in a final R = 0.025 ( R w = 0.0324). There appears to be no or little π-interaction between the triazole ligand and the chromium atom.