Crystal structure of phosphonium carboxylate complexes. The role of the metal coordination geometry, ligand conformation and hydrogen bonding
Crystal structure of phosphonium carboxylate complexes. The role of the metal coordination geometry, ligand conformation and hydrogen bonding
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DOI：
10.1039/c4ce01361a
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发表时间：
2014-09
期刊：
影响因子：
3.1
通讯作者：
I. Galkina;A. Tufatullin;D. Krivolapov;Yuliya V. Bakhtiyarova;D. Chubukaeva;V. Stakheev;V. Galkin;R. Cherkasov;B. Büchner;O. Kataeva
中科院分区：
文献类型：
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作者：
I. Galkina;A. Tufatullin;D. Krivolapov;Yuliya V. Bakhtiyarova;D. Chubukaeva;V. Stakheev;V. Galkin;R. Cherkasov;B. Büchner;O. Kataeva
在室温水溶液中合成了一系列新的羧酸盐甜菜碱与重要金属离子Zn（II）、Cd（II）、Hg（II）和Cu（II）的单核和杂合配合物。X射线单晶衍射表明，羧酸盐甜菜碱具有多种络合能力，可产生单体、二聚体和四聚体同核和混合金属配合物。结合模式被发现改变系列的Zn（II），Cd（II）和Hg（II）的配合物与阳离子半径的增加。与金属结合的水和氯原子在晶体形成中起着重要作用。在α-和β-取代的磷杂甜菜碱的情况下，观察到各种立体异构体的结晶，包括在一个晶体中两种非对映异构体共结晶的罕见情况。
A series of new mononuclear and heteronuclear complexes of carboxylate phosphonium betaines with biologically important metals (Zn(II), Cd(II), Hg(II) and Cu(II)) were obtained in aqueous media at ambient temperature. X-ray single crystal diffraction showed that carboxylate phosphonium betaines exhibit versatile complexation abilities, producing monomeric, dimeric and tetrameric homonuclear and mixed metal complexes. The binding mode was found to change in the series of Zn(II), Cd(II) and Hg(II) complexes with an increase of the cation radius. Water and chlorine atoms, bound to the metal, play an important role in crystal formation. In the case of α- and β-substituted phosphabetaines, the crystallization of various stereoisomers was observed including a rare case of co-crystallization of two diastereomers in one crystal.