作　　者： ; ; ; ; ; ; ;

机构地区： 海南师范大学化学与化工学院

出　　处： 《海南师范大学学报（自然科学版）》 2010年第3期278-282,299,共6页

摘　　要： 在中性水溶液中合成了Keggin型钴取代硅钨杂多阴离子SiW11O39Co(II)(H2O)6-(SiW11Co),并进行了IR、UV-vis和循环伏安表征.IR和UV-vis实验表明,SiW11Co在960,904、810和748cm-1处有四个特征振动吸收峰,分别对应于Si-Oa、W=Od、W-Ob-W和W-Oc-W的反对称伸缩振动.在200nm和252nm处有两个很强的紫外吸收峰,分别对应于Od→W和Ob,Oc→W荷移跃迁;在400nm和546nm处有两个较强的可见吸收峰,分别对应于O(dH2O)→dCo和Ob,Oc→dCo荷移跃迁.循环伏安和交流阻抗实验表明SiW11Co有一对Co波和两对W-O骨架波,前者的电极过程具有不可逆的性质,为电荷传递动力学控制过程;后者的电极过程具有可逆的性质,为扩散控制过程.两者的电极过程均涉及H+. Keggin-type Co（II）-substituted heteropolyanion SiW11O39Co（II）（H2O）6-（SiW11Co） was synthesized in neutral aqueous solution and characterized by IR, UV-vis and cyclic voltammetry.IR and UV-vis experimental results showed that SiW11Co has four characteristic absorption peaks at the position of 960,904、810 and 748 cm-1 corresponding to the anti-symmetric stretching vibration of Si-Oa, W=Od, W-Ob-W and W-Oc-W, respectively, and two strong UV absorp-tions at near 200 nm and 252 nm attributed to Od→W and Ob,Oc→W charge-transfer transition as well as two visible absorption peak at near 400 nm and 546 nm attributed to Od （H2O）→dCo and Ob,Oc→dCo charge-transfer transition.Cyclic voltammetry and alternating current impedance experiments revealed a pair of Co redox wave and two pairs of W-O skeleton-waves for SiW11Co.The Co redox wave is an electron-transfer-controlled and irreversible process.The W-O skeleton-waves are diffusion-controlled and reversible processes.All of the electrode processes are involved in H＋.

关 键 词： 钴取代硅钨杂多阴离子 红外光谱 紫外可见光谱 循环伏安 交流阻抗

领　　域： [理学] [理学]