Chelation of and Th^IV by N,N′-bis(pyridoxylideneiminato)R (R = n-propyl, diethylamine), new dianionic Schiff bases derived from vitamin B6: Synthesis and structural features of [Th(pyr₂pen)₂] (pen =&

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• 作者：Davi Fern ; o Back ; Gelson Manzoni de Oliveira ; Jaqueline Pinto Vargas ; Ernesto Schulz Lang ; Greice Tabarelli
• 关键词：Complex chelates of uranium(VI) and thorium(IV) ; Bioinorganic chemistry of uranium and thorium ; Metallation of biological ligands
• 刊名：Journal of Inorganic Biochemistry
• 出版年：2008
• 期刊代码：53_01620134
• 类别：ch
• 出版时间：April 2008
• 卷：102
• 期：4
• 页码：666-672
• 文件大小：336 K

摘要

Th(NO₃)₄ · 5H₂O reacts with H₂pyr₂pen {propylenediamine-bis(pyridoxylideneimine)}, UO₂(NO₃)₂ · 6H₂O reacts with H₂pyr₂pen and H₂pyr₂dien {diethylenetriamine-bis(pyridoxylideneimine)} under deprotonation of the endo hydroxyl groups of the Schiff bases rings to give the chelate complexes [Th(pyr₂pen)₂] (1), [UO₂(pyr₂pen)(CH₃OH)] (2) and [UO₂(pyr₂dien)] · 2H₂O (3). In 1 the thorium center is the common vertex of two square pyramids displaced on 45° to each other. In 2 and 3 the uranium atoms are the centers of distorted pentagonal bipyramides. In 2 a methanol molecule achieves the coordination number 7 of the uranium(VI) ion, in 3 the central N atom of the dien section of the ligand accomplishes the coordination polyhedra, resulting a chelate complex with remarkable higher symmetry.