Synthesis and epr study of mono- and binuclear copper and oxovanadium complexes with compartmental isothiosemicarbazone

Geru Ion; Gaiu Nicolae; Zhovmir F.; Lozan Vasile

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817

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2022-12-27 15:32

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GERU, Ion, GAIU, Nicolae, ZHOVMIR, F., LOZAN, Vasile. Synthesis and epr study of mono- and binuclear copper and oxovanadium complexes with compartmental isothiosemicarbazone. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 102. ISBN 978-9975-62-428-2.

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Achievements and perspectives of modern chemistry 2019

Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Synthesis and epr study of mono- and binuclear copper and oxovanadium complexes with compartmental isothiosemicarbazone

Pag. 102-102

Geru Ion¹, Gaiu Nicolae¹², Zhovmir F.¹, Lozan Vasile¹

¹ Institute of Chemistry,
² Moldova State University

Disponibil în IBN: 5 noiembrie 2019

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On template condensation of 3-formylsalicylic acid S-methylisothiosemicarbazone with 3formylsalicylic acid and Cu(CH3COO)2·H2O (molar ratio 1:1:1) in DMF was obtained mononuclear compound [Cu(L-(COOH)2)]·0.5DMF (1), where L-(COOH)2 represents compartmental ligand N1N4-bis(3-carboxysalicylidenato)-S-methylisothiosemicarbazide (va COOH=1723 cm-1,v.s.). On interaction of 1 with an excess of Cu(CH3COO)2·H2O in DMF in open reaction vessel the dicopper compound [Cu2(L-(COO)2)] 3H2O (2)was synthesized. Reaction of 1 via intermediate Li salt with equimolar VO(SO4)·5H2O in DMSO was isolated heteronuclear complex [CuVO(L-(COO)2)]·DMSO (3).The EPR spectra at room temperature of all three complexes 1 (Figure 1), 2 and 3 (Figure 2) consist of a single resonance line without hyperfine structure with parameters: g=2.054, deltaHpp = 131.5 Oe (1); g=2.046, delta Hpp=288.6 Oe (2); g=2.061, delta Hpp=53.2 Oe (3). In Figure 3 and 4 the dependence of Gauss function fG(H-H0) (black circles) and Lorentz function fL(H-H0) (open circles) versus (H-H0)2 in linearized coordinates are presented. Based on the method of linear anamorphoses [1] it was shown that at room temperature the narrowing of EPR lines of 2 and 3arises due to exchange interaction between paramagnetic ions presented in 2 and, correspondingly, 3. Using the data from Figure 3 and Figure 4, the exchange fields He=240 ±30 Oe (2) and He=220 ±30 Oe (3) were determined.

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