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https://hdl.handle.net/20.500.14279/9964
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 |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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