SYNTHESIS AND SPECTRAL CHARACTERISTICS OF HETEROMETALLIC COMPLEXES OF Pr(III) WITH Zn(II), CO(II) BASED ON ETHYLENEDIAMINETETRAACETIC AND ETHYLENEDIAMINEDISUCCINIC ACIDS

• DOI: 10.33609/2708-129x.87.03.2021.3-17
• Publication Date: 2021-05-13T15:14:54Z
• Authors: Elena Trunova; Artem Mishchenko; Tamara Makotryk
• Keywords: Ethylenediaminetetraacetic acid; Praseodymium; Hypsochromic shift

New heterometallic f-d-complexes of Pr (III), Co(II), Zn(II) with aminopolycarboxylic acids (ethylenediaminetetraacetic, ethylenediaminedisuccinic acids) have been synthesized and spectroscopically characterized. It was found that complexes a molar ratio Pr:M3d: EDTA=1:2:2 are formed for ethylenediaminetetraacetic compounds, in the case based on EDDS, heteronuclear compounds equimolar composition Pr: M3d: EDDS = 1: 1 formed. is shown it expedient to carry out synthesis basis mono­nuclear polycarboxylates 3d metals, which act as «building block» preparation heterobinuclear compound by exo coordination additional metal ions. The characterized method electron absorption spectroscopy. independent 3d-metal, both systems hypsochromic shift maxima relative νmax observed homonuclear praseodymium complex. For ethylenediaminetetraacetate systems, undergo low- high-frequency shift, indicates different nature ligand field effect, caused primarily differences structure corresponding heteronuclearaminopolycarboxylates due presence chiral carbon atom molecule. supersensitive transitions Pr(III)) 3H4 →3P2 → 1D2 , covalence parameters Ln-O bond calculated: osci­llator power (P), nepheloxetic parameter (β), (b1/2), Sinha (δ). Analysis spectroscopic decrease lanthanide-ligand transition from mono- complex, local symmetry lanthanide ion occurs order Ln (III) aqua <hete­rometallic complex <monometallic Heteronuclear several orders magnitude more stable than mononuclear ones formation bonds or metallacycles donor atoms. noted stability lower EDTA size number chelated metallacycles. obtained belong folded complexes, ligand-complexone realizes maximum denticity ion, sphere 3d-cation carboxyl groups / inner-sphere water molecules. In this case, ions 3d-metals distorted octahedral environment, Pr(III) 8.