十八钼硫酸四丁基铵在DMF溶液中的光化学研究

PHOTOCHEMICAL RESEARCH ON TETRAKIS(TETRABUTYLAMMONIUM) OCTADECAMOLYBDODISULFATE (Ⅵ) IN DMF SOLUTION

通过循环伏安、五价钼的测定、紫外-可见吸收光谱及还原物种的制备和表征，研究了α－Dawson型[BU4N]4S2MO18O62在DMF溶液中的光化学，考察了有机酸对光化学还原的影响．结果表明在中性或较低酸浓度下只形成1-电子还原物种，在较高酸浓度下则进一步形成4-电子还原物种，介于这两者之间还存在一个2-电子还原的中间过程．

This paper describes the photochemistry of a-Dawson type, [Bu4N]4S2Mo18O62 in DMF solutionwith and without organic acid,based on the cyclic voltammogram, measure ment of Mo (V ), UV-Vis Spectraand characterization of one- and four-electron reduced species. The results show that photoexcitation leads tothe-reduction of Mo' to Mo with accompanying formation of one-electron reduced species and the formationof four-electron reduced species in the presence of the high concentration of acetic acid. Moreover,two-electron reduced form may exist as the imtermediste between one-and four-electron reduced steps.