Complexes of divalent transition metal ions with bis(aminomethyl)phosphinic acid in aqueous solution and in the solid state
作者:Vojtěch Kubíček、Pavel Vojtíšek、Jakub Rudovský、Petr Hermann、Ivan Lukeš
DOI:10.1039/b305844a
日期:——
metal ion in a strong acid solution. The X-ray structures show several coordination modes in the solid state. All-trans-[MCl2(H2L-O)2(H2O)2]Cl2, where M(II) are Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Ca(II), and Cd(II), crystallized from acid solutions. The central ion is octahedrally coordinated with two phosphinate oxygen atoms, two molecules of water and two chlorides in all-trans arrangement. Amine
双(氨基甲基)次膦酸(NH 2 CH 2)2 PO 2 H(HL),是使用新方法合成的。研究了其在溶液和固态下对Co(II)/(III),Ni(II),Cu(II)和Zn(II)的配位能力。由于存在两个氮原子 这 配体与普通的(氨基烷基)次膦酸相比,具有更高的总体碱性。因此,所确定的稳定常数的值与(氨基烷基)膦酸所发现的稳定常数是可比的。Zn(II)的NMR滴定表明在强酸溶液中次膦酸酯与金属离子的相互作用。X射线结构在固态下显示出几种配位模式。全反式-[MCl 2(H 2 L- O)2(H 2 O)2 ] Cl 2,其中M(II)是Mn(II),Co(II),Ni(II),Cu(II)锌(II),Ca(II)和Cd(II),从酸性溶液中结晶出来。中心离子与两个次膦酸酯氧原子,两个水两种氯化物呈全反式排列。胺基是质子化的且不协调。从中性溶液中分离出的晶体中供体基团的参与取决于金属离子。所有供体原子配位以单体FAC