SYNTHESIS AND CHARACTERIZATION OF SULFUR-CAPPED TRINUCLEAR GROUP-6B METAL-CLUSTERS Academic Article uri icon

abstract

  • The sulfur-capped trlnuclear chromium carbonyl cluster S[Cr(CO)4]32- has been synthesized and shown to arise via carbon monoxide loss from the COsaturated S[Cr(CO)5]32- species. The carbon monoxide ligands display complete stereochemical nonrigidity at ambient temperature. In a low-energy process that occurs below -60 C the bridging carbon monoxide groups and the set of terminal CO groups that are cis to the capping sulfide moiety undergo fast exchange when compared to their chemical shift differences (1218 Hz at 50.3 MHz). A subsequent, higher energy exchange process of these carbon monoxide ligands with the remaining terminal carbonyl sites (those trans to the sulfide cap) occurs at temperatures greater than -20 C. Addition of Cr(13CO)5THF to the S[Cr(CO)4]32- trimer results in formation of (CO)5CrS [Cr(CO)4]32-, where the 13CO ligands are shown to be statistically distributed throughout the tetrameric species. 1984, American Chemical Society. All rights reserved.

published proceedings

  • ORGANOMETALLICS

author list (cited authors)

  • DARENSBOURG, D. J., & ZALEWSKI, D. J.

citation count

  • 11

complete list of authors

  • DARENSBOURG, DJ||ZALEWSKI, DJ

publication date

  • October 1984