TY - JOUR
T1 - Chemical mechanism of dioxygen activation by manganese(III) Schiff base compound in the presence of aliphatic aldehydes
AU - Suzuki, Miyuki
AU - Ishikawa, Takashi
AU - Harada, Akihiko
AU - Ohba, Shigeru
AU - Sakamoto, Masatomi
AU - Nishida, Yuzo
PY - 1997
Y1 - 1997
N2 - The manganese(III) complexes with tetradentate Schiff base [H2(L)] derived from salicylaldehyde and 2-amino-1-benzylamine [abbreviated as H2(salabza)], ethylenedimaineand 2-hydroxybenzophenone [H2(7-Phe-salen)], ethylenediamine and 2-hydroxyacetophenone [H2(7-Me-salen)] showed much higher activity for degradation of tetraphenylcyclopentadienone(TCPN) the singlet oxygen (1Δg) scavenger, in the presence of cyclohexanecarboxaldehyde than those of the compounds with H2(salen) and H2(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 MnIII 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 MnIII 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.
AB - The manganese(III) complexes with tetradentate Schiff base [H2(L)] derived from salicylaldehyde and 2-amino-1-benzylamine [abbreviated as H2(salabza)], ethylenedimaineand 2-hydroxybenzophenone [H2(7-Phe-salen)], ethylenediamine and 2-hydroxyacetophenone [H2(7-Me-salen)] showed much higher activity for degradation of tetraphenylcyclopentadienone(TCPN) the singlet oxygen (1Δg) scavenger, in the presence of cyclohexanecarboxaldehyde than those of the compounds with H2(salen) and H2(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 MnIII 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 MnIII 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.
KW - Activation of dioxygen
KW - Dioxygen and aldehyde
KW - Mn(III) Schiff base compounds
KW - Mn(III) and Fe(III) compounds
UR - http://www.scopus.com/inward/record.url?scp=0009601077&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0009601077&partnerID=8YFLogxK
U2 - 10.1016/S0277-5387(97)00003-X
DO - 10.1016/S0277-5387(97)00003-X
M3 - Article
AN - SCOPUS:0009601077
SN - 0277-5387
VL - 16
SP - 2553
EP - 2561
JO - Polyhedron
JF - Polyhedron
IS - 15
ER -