A nuclear magnetic resonance line broadening study of dimethyl sulfoxide in tris(ethylenediamine)chromium(III)-dimethyl sulfoxide solution

Academic Article

Abstract

  • Proton nmr line broadening studies of DMSO in Cr(en) -DMSO solutions were conducted between 20 and 90°. The resulting data were interpreted using the Swift-Connick relationship. The dominant contribution to line broadening in the temperature range 20-50° was a second coordination sphere exchange process. Above 70°, the dominant process was a first coordination sphere exchange process of partially dissociated Cr(en) . The kinetic parameters for the first and second coordination sphere processes respectively were found to be ΔH‡° = 25 kcal/mol, k = 1.4 sec and ΔH‡′ = 6.6 kcal/mol, k′ = 1.2 × 10 sec . A discussion is given of the possibility of electron transfer through second coordination sphere bonding. 3 3 3+ 3+ 0 -1 3 -1
  • Authors

    Published In

    Digital Object Identifier (doi)

    Pubmed Id

  • 14649814
  • Author List

  • Watkins CL; Vigee GS; Harris ME
  • Start Page

  • 855
  • End Page

  • 858
  • Volume

  • 77
  • Issue

  • 6