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Contact shift studies of some paramagnetic octahedral complexes: Diphenylsulfoxide complexes of iron(II), cobalt(II), and nickel(II)

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
32
Issue
3
Identifiers
DOI: 10.1016/0022-1902(70)80066-5

Abstract

Abstract The proton NMR isotropic shifts of the octahedral diphenylsulfoxide (DPSO) complexes, M(DPSO) 6(ClO 4) 2, of Fe(II), Co(II), and Ni(II), in CDCl 3 are reported. From a consideration of the magnitude and concentration dependence of these isotropic shifts, it is concluded that the pseudocontact contribution to the isotropic shifts is very important for Co(DPSO) 6 2+ but not for Ni(DPSO) 6 2+ and Fe(DPSO) 6 2+. Also in the latter two complexes, the unpaired spin is probably delocalized within the ligand by a combination of both σ and π-mechanisms.

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