Open AccessSYNTHESIS, SPECTRAL CHARACTERIZATION AND STABILITY OF THE NEW ND (III) AND CO (II) HETEROMETALLIC COMPLEXES WITH AMINOPOLYCARBOXYLIC ACIDS
Author(s) -
Оlena Trunova,
Artem Mishchenko,
Tamara Makotryk
Publication year - 2022
Publication title -
ukraïnsʹkij hìmìčnij žurnal
Language(s) - English
Resource type - Journals
eISSN - 2708-129X
pISSN - 2708-1281
DOI - 10.33609/2708-129x.88.02.2022.116-130
Subject(s) - heteronuclear molecule , chemistry , square antiprism , homonuclear molecule , crystallography , octahedron , denticity , coordination sphere , molecule , ligand (biochemistry) , titration , coordination number , ethylenediaminetetraacetic acid , inorganic chemistry , chelation , crystal structure , ion , organic chemistry , biochemistry , receptor , oxygen atom
New heterometallic complexes of Nd(III) and Co(II) based on ethylenediaminetetraacetic and ethylenediaminedisuccinic acids have been synthesized. The complexes studied by electron absorption spectroscopy, IR-spectroscopy, and thermogravimetric analysis. The influence of a number of factors on the properties and structure of heteronuclear complexes is discussed. The spectral characteristics of homonuclear and heteronuclear complexes are compared. A theoretical analysis of the geometry of Co(II) and Nd(III) complexes with ethylenediaminesuccinic acid was carried out by the semi-empirical PM7 method. It has been shown that the f-d-complexes are of the folded type, in which the ligand-complexone realizes the maximum denticity to Nd(III), and the Co(II) coordination sphere is formed by bridging edta/edds carboxyl groups and intrasphere water molecules. The Co(II) coordination polyhedron corresponds to a distorted octahedron, and the Nd(III) coordination polyhedron corresponds to a one-capped square antiprism (C4v) with the coordination number Nd(III)=8. During study fixed that heterometallic complexes have the same structure in solutions and in the solid state.