Synthesis and characterization of vanadium(IV) and (V) complexes with 2-Hydroxy-acetophenone-semicarbazone ('H IND. 2'hasc) as ligand: X-ray crystal structures of [V'O IND. 2'('H IND. 2'hasc)] and [V'O IND. 2'(Hhasc)] - Maia, Pedro Ivo da Silva; Deflon, Victor Marcelo; Sousa, Gerimário F.; Lemos, Sebastião S.; Batista, Alzir Azevedo; Nascimento, Otaciro Rangel; Niquet, Elke (Zeitschrift für Anorganische und Allgemeine Chemie, 2007)