CIRCULAR DICHROISM OF COBALT(III) COMPLEXES OF THE TYPE[Co(N)6] CONTAINING BIGUANIDE, AND 2,2′-DIPYRIDYL OR 1,10-PHENANTHROLINE

Abstract Biguanide-diamine mixed complexes of the type [Co(diamine)(Hbg)2]3 and [Co(diamine)2 (Hbg)]3+, where the diamines are 1,10-phenanthroline or 2,2′-dipyridyl, have been prepared and resolved. The absorption and circular dichroism (CD) spectra in water, 0.1 M NaOH aqueous solution, and ethanol are reported. Hydroxide ion affects the CD intensity mainly in the first absorption band region. A marked solvent effect of ethanol was also observed for both absorption and CD spectra especially in the first absorption band region. The absolute configurations for all of these complexes are assigned on the basis of their CD spectra.

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