Abstract
Five monooxovanadium(V) complexes [VO(L1)(OCH3)(OHCH3)] (1), [VO(L2)(OCH3)(OHCH3)] (2), [VO(L3)(OCH3)(OHCH3)] (3), [VO(L4)(OCH3)(OHCH3)] (4), and [VO(L5)(OCH3)(OHCH3)] (5) were synthesized and characterized by IR, NMR UV‐Vis, and single‐crystal structure analysis [H2L1 = (E)-N′‐((2‐hydroxynaphthalen‐1‐yl)methylene)furan‐2‐carbohydrazide, H2L2 = (E)-N′‐(2‐hydroxybenzylidene)furan‐2‐carbohydrazide, H2L3(E)-N′‐(5‐bromo‐2‐hydroxybenzylidene)furan‐2‐carbohydrazide, H2L4 = (E)-N′‐(2‐hydroxy‐5‐nitrobenzylidene)furan‐2‐carbohydrazide, H2L5 = (E)-N′‐(2‐hydroxy‐5‐iodobenzylidene)furan‐2‐carbohydrazide]. In all 1–3 structures the vanadium atom has a distorted octahedral coordination with the three meridional donor atoms from the Schiff base dianion (L1–3)2− and one methoxylato group occupying the sites of the equatorial plane. The oxo group and one methanol molecule occupy the apical sites. In the complexes 1, 2, and 3 the conformation of 2‐furanyl oxygen atom relative to the carbohydrazide oxygen atom is s‐anti, s‐anti/s‐syn, and s‐syn at 293 K, respectively. Cyclic voltammetric experiments of the solution species 1–5 in DMSO revealed a quasi‐reversible behavior.
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