Sulfur base ligation to iron(II) and cobalt(II) porphyrins.
Equilibrium constants for the binding of sulfur bases to cobalt(II) porphyrins were measured in toluene solution by a spectrophotometric method. The order of decreasing binding strength of sulfur ligands to cobalt(II) porphyrins was found to be mercaptide ions >> thioethers > mercaptans. It is suggested that a similar stability order of these sulfur ligands should exist towards iron(II) porphyrins, but formation constants could be obtained only for the mercaptide ions.
Department of Chemistry, Northwestern University, Evanston, Illinois 60201.
P E
PE
Ellis
R D
RD
Jones
F
F
Basolo