Synthesis, spectral and EPR studies of oxovanadium(IV) complexes incorporating tridentate ONO donor hydrazone ligands: Structural study of one oxovanadium(V) complex

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• 作者：E.B. Seena ; Nancy Mathew ; Mini Kuriakose ; M.R. Prathapach ; ra Kurup
• 关键词：2-Hydroxy-4-methoxybenzaldehyde ; 2-Hydroxy-4-methoxyacetophenone ; Nicotinoylhydrazide ; Oxovanadium(IV) complexes ; 2 ; 2′ ; -Bipyridine ; 1 ; 10-Phenanthroline ; X-ray crystallography
• 刊名：Polyhedron
• 出版年：2008
• 出版时间：7 April 2008
• 年：2008
• 卷：27
• 期：5
• 页码：1455-1462
• 全文大小：636 K

文摘

Five oxovanadium(IV) complexes of 2-hydroxy-4-methoxybenzaldehyde nicotinic acid hydrazone (H₂L¹), 2-hydroxy-4-methoxyacetophenone nicotinic acid hydrazone (H₂L²) and a binuclear oxovanadium(V) complex of H₂L² have been synthesized. These complexes were characterized by different physicochemical techniques like electronic, infrared and EPR spectral studies. The complexes [VOL¹]₂ · H₂O (1) and [VOL²]₂ · H₂O (4) are binuclear and [VOL¹bipy] (2), [VOL¹phen] · 1.5H₂O (3) and [VOL²phen] · 2H₂O (6) are heterocyclic base adducts and are EPR active. In frozen DMF at 77 K, all the oxovanadium(IV) complexes show axial anisotropy with two sets of eight line patterns. The complex [VOL² · OCH₃]₂ (5) is an unusual product and has distorted octahedral geometry, as obtained by X-ray diffraction studies.