Synthesis and study of binuclear vanadyl complexes with acyldihydrazones of salicylaldehyde and dicarboxylic acids |
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| Authors: | Shul"gin V F Zlatogorskii S M Zub V Ya Larin G M |
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| Institution: | (1) V. I. Vernadskii Taurida National University, 4 ul. Yaltinskaya, 95007 Simferopol, Ukraine;(2) Taras Shevchenko Kiev State University, 60 ul. Vladimirskaya, 01033 Kiev, Ukraine;(3) Russian Academy of Sciences, N. S. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninsky prosp., 119991 Moscow, Russian Federation |
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| Abstract: | The binuclear vanadyl(ii) complexes (VO)2·2Py·2EtOH]·mH2O with acyldihydrazones of salicylaldehyde (H4L) and dicarboxylic acids were synthesized and studied. In these complexes, two chelate vanadyl(ii) complexes with the tridentate bicyclic ligands are linked to each other by the polymethylene bridges —(CH2)
n
— of different lengths varying from one to four units. The ESR spectra of solutions of these complexes, unlike those of analogous copper(ii) complexes, have an isotropic signal with an eight-line hyperfine structure (g = 1.972, a
V = 93·10–4 cm–1) typical of monomeric vanadyl complexes, which indicates that no exchange interactions occur between the paramagnetic centers through the polymethylene chain. |
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| Keywords: | ESR spectroscopy hyperfine structure spin-spin exchange interactions binuclear vanadyl(ii) complexes acyldihydrazones of salicylaldehyde and dicarboxylic acids |
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