Facultatea de Chimie şi Tehnologie Chimică / Faculty of Chemistry and Chemical Technology
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Item Heterometallic compounds with the binuclear complex anion [Cr 2(OH)(Ac)(Nta)2]2-: Synthesis and structure [Articol](2009) Ciornea, Victor; Șova, Sergiu; Novițchi, Ghenadie; Ganju, Dumitru; Cajeva, Olga; Gulea, Aurelian; Simonov, IurieHeterometallic compounds BaCr2(OH)(Ac)(Nta)2 • 4H2O (I) and [Fe(L)3][Cr2(OH)(Ac)(Nta) 2] • nH2O (L is Bipy (II) and Phen (III); Bipy is, αα′-bipyridine, Phen is o,o′-phenanthroline, Ac - is acetate ion, Nta is nitrilotriacetate ion; n = 8 (II) and 6.25 (III)) are synthesized. According to the X-ray diffraction data, compounds II and III have ionic structures built of the isolated complex cations [Fe(L) 3]2+, binuclear complex anions [Cr2(OH)(Ac) (Nta)2]2-, and crystallization water molecules. The magnetic properties of compounds II and III in the interval from 2 to 300 K confirm assumptions on the diamagnetic character of [Fe(L)3] 2+ and indicate the antiferromagnetic interaction between the chromium atoms in the dimeric fragment [Cr2(OH)(Ac)(Nta) 2]2-.Item Synthesis and structure of heterometallic chromium(III) complexes with ethylenediaminetetraacetic acid [Articol](2005) Ciornea, Victor; Filippova, Irina; Gulea, Aurelian; Șova, Sergiu; Borta, A.; Simonov, IurieThe complexes [M(Tsc)2][Cr(Edta)]2, where M is Ni, Cu; Tsc is thiosemicarbazide; Edta4- is the ethylenediaminetetraacetate anion, were synthesized and characterized by X-ray diffraction. The ionic structures are composed of the [M(Tsc)2] 2+ cations and [Cr(Edta)]- anions with a component ratio of 1 : 2. The cation has a distorted trans-square coordination. The carboxyl groups of the H4Edta molecule are deprotonated and the ligand is attached to the Cr atom in the hexadentate chelating mode. The cations and anions are linked by a system of hydrogen bonds.Item Synthesis and physico-chemical studies of heterometallic nitrilotriacetates of chromium(III) with some 3d metals [Articol](2006) Ciornea, Victor; Gulea, AurelianHeterometallic complexes of chromium (III) with some 3d metals have been synthesized based on nitrilotriacetic acid (H3 nta), like M(bpy)2 Cr2 (OH)2 (nta)2·nH2O, where M = Mn 2 , Co2 , Ni 2 and Zn2 ; bpy = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from the results of the elemental analysis and thermogravimetric study. The coordination modes of the nta3¯ ligand and the type of chemical bonds have been proposed basing on IR spectra.Item Synthesis and physico-chemical studies of heterometallic nitrilotriacetates of chromium(III) with some 3d metals [Articol](Academia de Știinițe a Moldovei, 2006) Ciornea, Victor; Gulea, AurelianHeterometallic complexes of chromium (III) with some 3d metals have been synthesized based on nitrilotriacetic acid (H3nta), like M(bpy)2Cr2(OH)2(nta)2·nH2O, where M = Mn2+, Co2+, Ni2+ and Zn2+; bp = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from the results of the elemental analysis and thermogravimetric study. The coordination modes of the nta3 ̄ ligand and the type of chemical bonds have been proposed basing on IR spectra.Item Synthesis and physico-chemical studies of heterometallic nitrilotriacetates of chromium(III) with some 3d metals [Articol](Institute of Chemistry of ASM, 2006) Gulea, Aurelian; Ciornea, VictorHeterometallic complexes of chromium (III) with some 3dmetals have been synthesized based onnitrilotriacetic acid (H3nta), like M(bpy)2Cr2(OH)2(nta)2·nH2O, where M = Mn2+, Co2+, Ni2+ and Zn2+; bpy = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from theresults of the elemental analysis and thermogravimetric study. The coordination modes of the nta3 ̄ ligand and the type of chemical bonds have been proposed basing on IR spectra.