M. E. Nikiforova

Unusual structure of new dimethylmalonate coordination polymer with strontium atoms and VO2+ fragments

A reaction of vanadyl sulfate VOSO4·3H2O with dimethylmalonic acid strontium salt led to the coordination polymer {Sr(H2O)8[VO(Me2mal)2]}n (1, Me2mal is the dimethylmalonic acid dianion), in which the carboxylate dianions did not form chelate metallocycles with the vanadyl ions. The complex was studied by ESR spectroscopy. The compound 1 exhibited weak spin-spin exchange interactions of ferromagnetic type between the VIV atoms.

New nickel(II) carboxylate-phosphonate cluster: Synthesis and structure

Dodecanuclear mixed-ligand complex [(μ2-Hmhp)6Ni12(μ3-OH)4(μ6-O3PPh)4(μ2-Piv)12] · 7.5MeCN · 1.5THF (I · 7.5MeCN · 1.5THF) was synthesized by the reaction of nickel(II) trimethylacetate [Ni9(OH)6(Piv)12(HPiv)4] (Piv− is the pivalate anion) and 6-methyl-2-hydroxypyridine (Hmhp) with phenylphosphonic acid potassium salt (K2O3PPh). The structure of complex I is determined by X-ray diffraction analysis. The geometry of the metal framework of the isolated complex is determined by the structure forming phosphonate anion.

Novel oxovanadium(IV) heterochelate complexes: synthesis, structure, ESR spectra, and photoluminescence properties

The reactions of oxovanadium(iv) salts with dimethylmalonate anions (H2Dmm — C3H6(COOH)2) and chelating N-donor ligands (2,2′:6′,2″-terpyridine (terpy), 2,2′-bipyridine (bpy)) led to the formation of new mononuclear heterochelate complexes [VO(Dmm)(terpy)]·4H2O (1) and [VO(Dmm)(bpy)(H2O)] (2). The structures of the synthesized compounds were determined by X-ray diffraction. The ESR spectra of the compounds at 293 and 100 K were analyzed and simulated. The photoluminescence properties were investigated.