氧齿配体锝配合物   Ⅰ.氧多齿配体锝(Ⅴ)配合物的结构及其性质

氧齿配体锝配合物 Ⅰ.氧多齿配体锝(Ⅴ)配合物的结构及其性质

摘要

摘要: 根据空腔模型中的经验结合规律，提出了各种含氧配位体与ＴｃＯ３＋的结合能力：ＨＯ－～ＲＯ－＞ＡｒＯ－＞Ｒ－ＰＯ３Ｈ－＞Ｒ－ＣＯ－２＞Ｃ＝Ｏ。在此序列和五配位四方锥构型基础上，解释了各氧多齿配体与ＴｃＯ３＋的结合性质。由于ＴｃＯ（ＯＨ）－４容易岐化为ＴｃＯ２·ｘＨ２Ｏ和ＴｃＯ－４，因而任何单齿氧ＴｃＯ３＋核配合物在水溶液中皆不稳定。多元醇、邻二酚、α羟基膦酸、α羟基羧酸的ＴｃＯ３＋配合物由于螯合效应，可能在水溶液中存在。

Abstract: OXYGEN ATOM COORDINATED TECHNETIUM COMPLEXESⅠTHE STRUCTURE AND PROPERTIES OF TECHNETIUM (Ⅴ) COMPOUNDS WITH OXYGEN MULTIDENTATE LIGANDSLiu Guozheng Miao Zengxing Wang Yishan Fang Jidong(Isotope Department,China Institute of Atomic Energy,Beijing 102413)ABSTRACTThe sequence of binding ability of TcO3＋ core to various oxygen donor ligands is given as HO－～RO－>ArO－>RPO3H－>RCOO－>C=O based on the existing experimental data and the previously described empirical rules.The coordination characters of TcO3＋ with multidentate oxygen donor ligands are rationalized by that sequence and the square pyramidal geometry of TcO3＋ complexes.Any complex of TcO3＋ with unidentate oxygen donor ligands is unstable because of its strong trend towards disproportionation to TcO2·xH2O and TcO－4.In contrast,complexes of TcO3＋ with polyhydric alcohols,odiphenols,2hydroxy phosphonates,and 2hydroxy carboxylates may stably exist in aqueous solution due to chelating effects.Keywords Cavity model Technetium compounds Stability Oxygen coordination atom TcO3＋ core

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