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Τίτλος: Structural and electron paramagnetic resonance (EPR) characterization of novel vanadium(V/IV) complexes with hydroquinonate-iminodiacetate ligands exhibiting "noninnocent" activity
Συγγραφείς: Drouza, Chryssoula 
Stylianou, Marios 
Papaphilippou, Petri Ch. 
Keramidas, Anastasios D. 
Major Field of Science: Agricultural Sciences
Field Category: Other Agricultural Sciences
Λέξεις-κλειδιά: Electron paramagnetic resonance (EPR);X-ray structure;Hydroquinone;Iminodiacetic;Oxovanadium compounds;Synthesis
Ημερομηνία Έκδοσης: 2013
Πηγή: Pure and Applied Chemistry, 2012, vol. 85, no. 2, 2013, pp. 329-342
Volume: 85
Issue: 2
Start page: 329
End page: 342
Περιοδικό: Pure and Applied Chemistry 
Περίληψη: Reaction of KVO3 with 2-[N,N′-(carboxymethyl)aminomethyl]-5-methylhydroquinone (H4mecah) in aqueous solution at pH 8.2 results in the isolation of mononuclear K2[VV(O)2{Hmecah(-3)}]·2H2O complex. On the other hand, reaction with the 2-[N,N′-(carboxymethyl)aminomethyl]-5-tert-butylhydroquinone (H4tbutcah) under the same conditions gives the tetranuclear mixed-valent complex K 6 [{V V O(μ-O)V IV O}{μ-tbutbicah(-6)}] 2·10.5H2O (H6tbutbicah, 2,2′-({2-[bis(carboxymethyl)amino]-3,6-dihydroxy-4-methylbenzyl}azanediyl)diacetic acid). The structures of both complexes were determined by single-crystal X-ray crystallography. The coordination environment of vanadium ions in both complexes is octahedral, with four out of the six positions to be occupied by the two cis carboxylate oxygens, one hydroquinonate oxygen, and one amine nitrogen atoms of the ligands' tripod binding sites. The importance of the chelate ring strains in the stabilization of the p-semiquinone radical is also discussed. A protonation of the ligated to vanadium(IV) ion hydroquinonate oxygen at low pH was revealed by continuous wave (cw) X-band electron paramagnetic resonance (EPR) and UV-vis spectroscopies.
URI: https://hdl.handle.net/20.500.14279/9964
ISSN: 00334545
DOI: 10.1351/PAC-CON-12-07-04
Rights: © IUPAC
Type: Article
Affiliation: Cyprus University of Technology 
University of Cyprus 
Publication Type: Peer Reviewed
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