Methods of Preparing the 2,2′-Dipyridyl and 1,10-Phenanthroline Cobalt(III) Complexes of the [CoX2dip2]- and [CoX2phen2]-Type

The bis(2,2′-dipyridyl) and bis(1,10-phenanthroline) cobalt(III) complexes of the [CoX2N4]-type, including the following new compounds, have been prepared: [Co(CN)2dip2]NO3·7H2O, [Co-(CN)2dip2]2SO4·12H2O, Na[Co(SO3)2dip2]·5H2O, Na[Co(S2O3)2dip2]·7H2O [Co(N3)2dip2]N3·2H2O, [Co(N3)2dip2]ClO4, [Co(N3)2dip2]2SO4·5H2O, [Co(N3)2dip2]NO3·2H2O, [Co(N3)2dip2]Cl·3H2O, [Co(SCN)2dip2]NCS·52H2O, [Co(SCN)2dip2]ClO4·2H2O, [Co(SCN)2dip2]Cl·3H2O, K[Co(SO3)2phen2]·5H2O, [Co(NO2)2phen2]Cl·4H2O, Na[Co(S2O3)2phen2], [Co(N3)2phen2]N3[Co(CN)2phen2]NO3·6H2O, [Co(CN)2phen2]Cl·4H2O. The known compounds, including the cobalt(II) and cobalt(III) complexes of the luteo type, have also been prepared by methods other than those described hitherto in the literature. The absorption spectra in the visible and ultraviolet regions have been measured and compared with those of the bis(ethylenediamine)cobalt-(III) complexes. The rhodanato-cobalt(III) complexes, [Co(SCN)2dip2]ClO4·2H2O and [Co-(SCN)2phen2]NCS, have been ascertained to be the sulfur-bonded thiocyanato complexes on the evidence of the absorption spectra in the visible and infrared regions.