The effects of polyammonium macrocycles on the spectroscopic and photochemical properties of the Co(EDTA)- . I- ion-pair have been investigated. The addition of a macrocycle to aqueous solutions containing Co(EDTA)- and I- causes an increase of the absorbance in the region of the ion-pair charge-transfer band, as well as an increase of the quantum yield for the intramolecular photooxidation reduction of the ion-pair. Both these effects are mainly, if not only, due to an increase of the association constant between Co(EDTA)- and I-, caused by the positive charge of the macrocycle bound to the complex. On the contrary no change was observed on the intrinsic photoreactivity of the excited ion-pair. This last result is discussed in comparison with the effects already observed on the ligand photodissociation of MC excited states of Co(III) cyanide complexes.
ISI Document Delivery No.: JF612Times Cited: 1
Cited Reference Count: 15
Pina, f parola, aj bencini, a micheloni, m manfrin, mf moggi, l
Pina, Fernando/C-8161-2011; Parola, A. Jorge/F-4048-2010
Parola, A. Jorge/0000-0002-1333-9076
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