dc.contributor.author | Rikkou, Maria P. | en |
dc.contributor.author | Manos, Manolis J. | en |
dc.contributor.author | Tolis, Evangelos I. | en |
dc.contributor.author | Sigalas, Michael P. | en |
dc.contributor.author | Kabanos, Themistoklis A. | en |
dc.contributor.author | Keramidas, Anastasios D. | en |
dc.creator | Rikkou, Maria P. | en |
dc.creator | Manos, Manolis J. | en |
dc.creator | Tolis, Evangelos I. | en |
dc.creator | Sigalas, Michael P. | en |
dc.creator | Kabanos, Themistoklis A. | en |
dc.creator | Keramidas, Anastasios D. | en |
dc.date.accessioned | 2019-11-21T06:22:33Z | |
dc.date.available | 2019-11-21T06:22:33Z | |
dc.date.issued | 2003 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/56074 | |
dc.description.abstract | Reaction of the non-oxo VIV species [VIVCl2(LOO)2] [LOO = acetylacetonate (acac-) or benzoylacetonate (bzac-)] with a chelate nitrogen-donor ligand LNN in acetonitrile leads to the reduction of VIV to VIII and the formation of the mononuclear VIII compounds of the general formula [VIIICl2(LOO)(LNN)] (LOO and LNN are acac- and bipy for 1 | en |
dc.description.abstract | acac- and 5,5′-me2bipy for 2 | en |
dc.description.abstract | acac- and 4,4′-tb2bipy for 3 | en |
dc.description.abstract | acac- and phen for 4 | en |
dc.description.abstract | bzac- and bipy for 5 | en |
dc.description.abstract | bzac- and phen for 6). The reduction of the VIV complexes was monitored by GC-MS and 1H NMR spectroscopy. Both one- and two-dimensional (2D COSY and 2D EXSY) 1H NMR techniques were used to assign the observed 1H NMR resonances of 1-6 in CD2Cl2 or CDCl3 solution. It appeared that in solution these VIII complexes form two isomers which are in equilibrium: cis-[VIIICl2(LOO)(LNN)] ⇌ trans-[VIIICl2(LOO)(LNN)]. 2D EXSY cross-peaks were clearly observed between bipy- and acac-hydrogen atoms of the two geometrical isomers of 1-3 as well as between bipy and acac- protons of the cis isomer, indicating a dynamic process that corresponds to cis-trans isomerization and a cis-cis racemization. The thermodynamic and kinetic parameters of the equilibrium between these two isomers were calculated for compounds 1 and 2 by using variable temperature (VT) NMR data. Both cis-trans isomerization and cis-cis racemization processes probably proceed with an intramolecular twist mechanism involving a trigonal prismatic transition state. Density functional calculations (DFT) also indicated such a rearrangement mechanism. | en |
dc.source | Inorganic chemistry | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84962345466&partnerID=40&md5=3670e797f79a214b41d8226673e33050 | |
dc.subject | article | en |
dc.subject | unclassified drug | en |
dc.subject | chemical analysis | en |
dc.subject | kinetics | en |
dc.subject | molecular biology | en |
dc.subject | molecular mechanics | en |
dc.subject | molecular interaction | en |
dc.subject | thermodynamics | en |
dc.subject | chemical structure | en |
dc.subject | temperature | en |
dc.subject | ligand | en |
dc.subject | proton nuclear magnetic resonance | en |
dc.subject | geometry | en |
dc.subject | nitrogen | en |
dc.subject | vanadium derivative | en |
dc.subject | molecular dynamics | en |
dc.subject | proton | en |
dc.subject | cis isomer | en |
dc.subject | parameter | en |
dc.subject | mass spectrometry | en |
dc.subject | reduction | en |
dc.subject | gas chromatography | en |
dc.subject | acetonitrile | en |
dc.subject | chelation | en |
dc.subject | hydrogen | en |
dc.subject | acetic acid derivative | en |
dc.subject | nuclear magnetic resonance | en |
dc.subject | acetyl acetonate | en |
dc.subject | benzoic acid derivative | en |
dc.subject | benzoyl acetonate | en |
dc.subject | cis trans isomerism | en |
dc.subject | prism | en |
dc.title | NMR and theoretical investigations on the structures and dynamics of octahedral bis(chelate)dichloro VIII compounds isolated by an unusual reduction of non-oxo VIV species | en |
dc.type | info:eu-repo/semantics/article | |
dc.description.volume | 42 | |
dc.description.issue | 15 | |
dc.description.startingpage | 4640 | |
dc.description.endingpage | 4649 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :7</p> | en |
dc.source.abbreviation | Inorg.Chem. | en |
dc.contributor.orcid | Keramidas, Anastasios D. [0000-0002-0446-8220] | |
dc.contributor.orcid | Kabanos, Themistoklis A. [0000-0001-6944-5153] | |
dc.gnosis.orcid | 0000-0002-0446-8220 | |
dc.gnosis.orcid | 0000-0001-6944-5153 | |