Synthesis and Properties of Heteropoly Tungstovanadogermanic Complexes with Rare Earths
来源期刊：JOURNAL OF RARE EARTHS2002年第2期
论文作者：赵儒铭 单永奎 彭军 周百斌 马慧媛
Key words：rare earths; heteropoly anions; Keggin structure;
Abstract: Ten tungstovanadogermanic complexes K13H2[Ln(GeW10VO39)2]nH2O (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Yb) were synthesized for the first time. Their structures were characterized by IR, UV, ESR, XPS, XRD and magnetic susceptibility. Their redox properties were studied by means of cyclic voctammetry and polargraphy. The results show that the complexes undergo three step reduction, the first step is the double electronic reversible, while the second and the third steps are irreversible. Their thermal stability studied by TG-DTA, IR and XRD at various temperature shows that the range of pyrolysis temperature is 450～500 ℃. The complex stability in solution investigated by the acid-alkali titration indicates that the range of pH in which the heteropoly anions can exist stably is pH=3.3～7.6 at room temperature.
赵儒铭1，单永奎2，彭军3，周百斌2，马慧媛3
(1.Department of Chemistry, Wuhan University, Wuhan 430072, China;
2.Department of Chemistry, Harbin Normal University, Harbin 150080, China;
3.Northeast Normal University, Changchun 130024, China)
Abstract:Ten tungstovanadogermanic complexes K13H2[Ln(GeW10VO39)2]nH2O (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Yb) were synthesized for the first time. Their structures were characterized by IR, UV, ESR, XPS, XRD and magnetic susceptibility. Their redox properties were studied by means of cyclic voctammetry and polargraphy. The results show that the complexes undergo three step reduction, the first step is the double electronic reversible, while the second and the third steps are irreversible. Their thermal stability studied by TG-DTA, IR and XRD at various temperature shows that the range of pyrolysis temperature is 450～500 ℃. The complex stability in solution investigated by the acid-alkali titration indicates that the range of pH in which the heteropoly anions can exist stably is pH=3.3～7.6 at room temperature.
Key words:rare earths; heteropoly anions; Keggin structure;
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