title: N-Salicylidenehydrazides as versatile tridentate ligands for dioxovanadium(V) complexes.
abstract: The Schiff base ligand derived from salicylaldehyde and benzoic acid hydrazide (H2salhyph) reacts with potassium metavanadate in methanol solution to yield the potassium salt of the corresponding cis-dioxovanadium(V) complex K[VO2(salhyph)] (1). 1 crystallizes with one molecule of methanol in the monoclinic space group P2(1)/c with a = 1332.3(7), b = 669.9(2), c = 1809.0(8) pm, beta = 100.96(4) degrees, and Z = 4. The reactions of 1 with several proton acidic compounds including water, methanol, ethane-1,2-diol (H2ed), and proton acids lead to neutral monooxovanadium(V) and cis-dioxovanadium(V) complexes ([VO2(Hsalhyph)] (2); [V2O3(salhyph)2] (3); [VO(OMe)(salhyph)(HOMe)] (4); [VO(Hed)(salhyph)] (5)). The crystal structure of 2 (triclinic space group P1 with a = 677.79(5), b = 842.89(7), c = 1214.66(9) pm, alpha = 79.931(1), beta = 75.466(1), gamma = 73.391(1) degrees, and Z = 2) reveals that the protonation of the cis-dioxovanadium(V) complex 1 occurs at the hydrazide nitrogen atom of the ligand system. This was confirmed by the spectroscopic properties of the deuterium derivative.
authors.affiliation: Fakultät für Chemie der Universität Bielefeld, Germany. winfried.plass@uni-bielefeld.de
authors.forename: W
authors.initials: W
authors.lastname: Plass
authors.forename: A
authors.initials: A
authors.lastname: Pohlmann
authors.forename: H P
authors.initials: HP
authors.lastname: Yozgatli
mesh_terms: D019817:Benzoic Acid / Q000737:chemistry; D003460:Crystallization; D006834:Hydrazines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D000432:Methanol / Q000737:chemistry; D008956:Models, Chemical; D015394:Molecular Structure; D014638:Vanadates / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D006834:Hydrazines; D008024:Ligands; C418626:N-salicylidenebenzylhydrazide; D014638:Vanadates; D019817:Benzoic Acid; D000432:Methanol