Abstract
The manganese(III) complexes with tetradentate Schiff base [H 2(L)] derived from salicylaldehyde and 2-amino-1-benzylamine [abbreviated as H 2(salabza)], ethylenedimaine and 2-hydroxybenzophenone [H 2(7-Phe-salen)], ethylenediamine and 2-hydroxyacetophenone [H 2(7-Me-salen)] showed much higher activity for degradation of tetraphenylcyclopentadienone(TCPN) the singlet oxygen ( 1 δ g) scavenger, in the presence of cyclohexanecarboxaldehyde than those of the compounds with H 2(salen) and H 2(salphen), which are derived from salicyaldehyde and ethylenediamine, and o-phenylenediamine, respectively. X-ray crystal structural determinations of the former three compounds and electrochemical data of all the compounds have given strong support for the conclusion that the active species for degradation of TCPN is an acylperoxo Mn III species coordinated by an aliphatic peracid chelate, which should be derived from aliphatic aldehyde and dioxygen, where the geometry of the tetradentate Schiff base around the Mn III ion is of cis-β-configuration. Under the same experimental conditions, the corresponding iron(III) compounds exhibited negligible activity towards the activation of the dioxygen molecule. This was explained in terms of the difference in electronic structures between the two metal ions.
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