Abstract
合成了以三联吡啶锇Os（Ⅱ）配合物为光敏剂的PS-Fe2S2型模拟铁氢化酶分子光催化剂1a及其分子间光催化模型化合物1b和2,研究了配合物1a和1b的吸收光谱,发光光谱及电化学性质.配合物1a和1b均表现出三联吡啶锇Os（Ⅱ）配合物的MLCT吸收峰;与不含Fe2S2基团的配合物1b相比,在配合物1a中三联吡啶锇Os（Ⅱ）配合物单元的发光被明显猝灭,猝灭程度为92%.而在同样浓度下,配合物1b与2组成的分子间体系中三联吡啶锇Os（Ⅱ）配合物的发光仅被猝灭了4%.通过Rehm-Weller方程计算得出由三联吡啶锇Os（Ⅱ）配合物单元到Fe2S2活性中心的光致电子转移自由能为正,表明分子内1a和分子间1b＋2体系均不能发生光致电子转移,体系发光猝灭的原因是三联吡啶锇Os（Ⅱ）配合物3MLCT激发态与铁氢化酶模拟活性中心Fe2S2的能量转移.
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