Helical ternary complexes of alkaline earth picrates with open-chain crown ether

作     者：刘伟生 温永红 刘雪原 谭民裕 

作者机构：Department of Chemistry and National Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2003年第46卷第4期

页      面：399-406页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.20071015) Key Project of Science and Technology of the Ministry of Education of China(Grant No.01170) Foundation for University Key Teacher by the Ministry of Education of China 

主　　题：alkaline earth metal, open chain crown ether, complex, helix coordination structure. 

摘      要：Four solid complexes of alkaline earth picrates with N,N,N′,N′-tetraphenyl-3,6,9-trioxaundecanediamide (TTD), M (Pic)2TTD (1, M = Mg; 2, M = Ca; 3, M = Sr; 4, M = Ba), have been prepared and characterized by elemental analysis, conductivity measurement, IR spectra, 1H NMR spectra and TG-DTA techniques. Crystal structure of complex 3 shows that the Sr(II) ion is 9-coordinated by five oxygen atoms from TTD and four oxygen atoms from two bidentate picrates, and the coordination polyhedron is distorted tricapped trigonal prism. TTD as a pentadentate ligand forms a right-handed helical coordination structure. The chelating helical chain has a relative fixed radius and then shows a high coordination selectivity to metal ion. The high selectivity of TTD to alkaline earth ions is explained elementarily from the special coordination structures.