水溶性金属卟啉光敏化还原甲基紫精动力学──金属卟啉化合物光催化反应研究（Ⅰ）

Kinetics of the Photoreduction of Methlviologen(MV￣(2+) Photosensitized by Water-Soluble Metalloporphyrins───Photochemical Reaclions Catalyzed by Metalloporphyrin Complexes(I)

用中－四（对二甲基丙磺基胺基）苯基卟啉作光敏剂，在电子给体三乙醇胺（ＴＥＯＡ）和电子受体甲基紫精（ＭＶＩ＿２）存在的情况下，研究了ＴＥＯＡ／ＭｅＴＰＳ／ＭＶ￣（２＋）／ＤＭＳＯ＋Ｈ＿２Ｏ（Ｖ／Ｖ＝８０：２０）体系的光敏化还原ＭＶ￣（２＋）动力学，并由动力学参数ａ，光诱导时间ｔ＿ｉ，初始反应速率υ＿０来衡量光敏剂的优劣。

The electron transfer between triethanolamine(TEOA)and methylviologen (MV￣(2+))wasphotosensitized by tetrakis(4-dimethylsulfonatopylanilino) metalloporphyrins [abb.MeTPS.Me=H_2, Zn( Ⅱ ), Ni(Ⅱ ), Cu(Ⅱ), Mn(Ⅱ)/(Ⅲ),Co(Ⅲ)],excited to their triplet state by visible lightin DMSO solution containing 20%V/V water at room temperature. According to the reaction mecha-nisms,the kinetic equation has been deduced.The kinetic papameter a,inductive time t_i and initial re-action rate υ_0 have been applied to measuring the photosensitivity of photosensitizers. To a,υ_0 and t_i,the greater a value,υ_0 value and the smaller t_i value were,the better the photosensitivity was.