Circular dichroism of cobalt(III) complexes of the type cis-[CoN2O4] and cis-[CoN4O2] containing acetylacetonate ion, 2,2'-bipyridine and 1,10-phenanthroline.

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Two new cobalt(III) complexes, [Co(acac)(bpy)2]2+ and [Co(acac)(phen)2]2+ (acac=acetylacetonate ion, bpy=2,2′-bipyridine and phen=1,10-phenanthroline) were prepared from the reaction of [Co(CO3)(bpy)2]+ and [Co(CO3)(phen)2]+, respectively, with acetylacetone, and converted to the partially resolved optically active forms using a SP-Sephadex ion-exchange column. [Co(acac)2(bpy)]+ was also resolved partially with a SP-Sephadex column. [Co(acac)2(phen)]+ was resolved with a combination of silver dibenzoyl-d-tartrate and dibenzoyl-d-tartaric acid. The circular dichroism (CD) spectra for these four complexes and for [Co(acac)2(en)]+ and [Co(acac)2(tn)]+ (en=ethylenediamine, tn=trimethylenediamine) were measured. A marked solvent effect was observed in the d-d transition region for the CD spectra of the [Co(acac)2L]+ complexes. The absolute configurations for all these complexes were assigned on the basis of their CD spectra.
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