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Crystal Structure, Antioxidant Properties and Characteristics in Aqueous Solutions of the Oxidovanadium(IV) Complex [VO(IDA)phen]·2H 2 O
Author(s) -
Pranczk Joanna,
Jacewicz Dagmara,
Wyrzykowski Dariusz,
Wojtczak Andrzej,
Tesmar Aleksandra,
Chmurzyński Lech
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500272
Subject(s) - chemistry , radical , aqueous solution , phenanthroline , abts , inorganic chemistry , cyclic voltammetry , nuclear chemistry , potentiometric titration , dpph , organic chemistry , antioxidant , ion , electrochemistry , electrode
A new oxidovanadium(IV) complex was prepared by the reaction of vanadyl acetylacetonate [VO(acac) 2 ], iminodiacetic acid (H 2 IDA) and 1,10‐phenanthroline (phen) in aqueous solutions. The crystal structure of [VO(IDA)phen] · 2H 2 O was determined by X‐ray diffraction crystallographic analysis. The stability of the title compound in aqueous solution was investigated by using potentiometric titration methods. Moreover, the kinetics of substitution reactions of the VO(IDA) binary complex with 1,10‐phenanthroline were investigated in aqueous solutions. These reactions were monitored spectrophotometrically at 249 nm by using stopped‐flow methods. Kinetic measurements were performed in the 293–308 K temperature range, at different concentrations (0.1–0.5 m M ) of the binary complex and at a constant concentration of phen (0.05 mmol/L). Moreover, the antioxidant properties of this complex against superoxide radicals were studied by nitrobluetetrazolium (NBT) and cyclic voltammetry (CV) and the antioxidant properties were also investigated against two organic radicals: the 1,1‐diphenyl‐2‐picrylhydrazyl radical (DPPH · ) and the 2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonic acid) radical (ABTS · + ) by using spectrophotometric methods. The results of the antioxidant tests show that VO(IDA)phen scavenges superoxide free radicals as well as organic radicals (ABTS · + and DPPH · ).