ビス(1,2-ジアリール-1,2-エチレンジチオラト)ニッケル錯体の一重項酸素の脱活性化能と一重項酸素に対する耐性におよぼすアリール基上の置換基効果

抄録

Bis(1, 2-diaryl-1, 2-ethylenedithiolato)nickel complexes (X-DTNi; where X represents the substituent in the aryl moiety in the ligand) are efficient quenchers for singlet oxygen.
The formation of 2, 5-dimethyl-2-hydroperoxy-5-methoxy-2, 5-dihydrofuran in the reaction. of 2, 5-dimethylfuran with ¹O₂ generated from H₂O₂ and NaC1O is suppressed more by 'X-DTNi with electron-donating X than by X-DTNi with electron-accepting X (Fig.1). Quenching of ¹O₂ by X-DTNi is not linear to the concentration of X-DTNi, and quenching is more efficient in higher concentrations of X-DTNi than in their lower concentrations. (Fig.1 and Table 2).
The durabilities of X-DTNi with electron-donating X against ¹O₂ are lower than those with electronaccentinu X (Fin.2).