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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Manos, M. J. | en |
| dc.contributor.author | Tasiopoulos, A. L. | en |
| dc.contributor.author | Tolis, E. L. | en |
| dc.contributor.author | Lalioti, N. | en |
| dc.contributor.author | Woollins, J. D. | en |
| dc.contributor.author | Slawin, A. M. Z. | en |
| dc.contributor.author | Sigalas, M. P. | en |
| dc.contributor.author | Kabanos, T. A. | en |
| dc.date.accessioned | 2015-11-24T16:56:35Z | - |
| dc.date.available | 2015-11-24T16:56:35Z | - |
| dc.identifier.issn | 0947-6539 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/10456 | - |
| dc.rights | Default Licence | - |
| dc.subject | ferromagnetism | en |
| dc.subject | intermolecular interaction | en |
| dc.subject | polyoxometalates | en |
| dc.subject | uhf calculations | en |
| dc.subject | vanadium | en |
| dc.subject | high-spin molecules | en |
| dc.subject | binuclear complexes | en |
| dc.subject | magnetostructural correlations | en |
| dc.subject | structural-characterization | en |
| dc.subject | orbital interactions | en |
| dc.subject | large clusters | en |
| dc.subject | magnets | en |
| dc.subject | exchange | en |
| dc.subject | crystal | en |
| dc.subject | core | en |
| dc.title | A new class of ferromagnetically-coupled mixed valence vanadium(IV/V) polyoxometalates | en |
| heal.type | journalArticle | - |
| heal.type.en | Journal article | en |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.identifier.primary | DOI 10.1002/chem.200390078 | - |
| heal.identifier.secondary | <Go to ISI>://000180868800013 | - |
| heal.identifier.secondary | http://onlinelibrary.wiley.com/store/10.1002/chem.200390078/asset/695_ftp.pdf?v=1&t=hmu8zvrz&s=866f1fc7502e7b47b0c9f34717c2861e728fcb60 | - |
| heal.language | en | - |
| heal.access | campus | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.publicationDate | 2003 | - |
| heal.abstract | Reaction of [V(VI)OCl(2)(thf)(2)] with a bidentate nitrogen-donor ligand (L: phen=1,10-phenanthroline, 5-mephen= 5-methyl-1,10-phenanthroline, bipy=2,2'-bipyridine, 5,5'-me(2)bipy=5,5'-dimethyl-2,2'-bipy) in methyl alcohol, in the presence of triethylamine, leads to the formation of hexameric [V(2)(IV)V(4)(V)] oxo-alkoxo-vanadates of the general formula [V(6)O(12)-(mu(2)-OCH(3))(4)(L)(4)].xH(2)O [L=phen (1 . 4H(2)O), 5-mephen (2 . 6H(2)O), bipy (3 . 4H(2)O), 5,5'-me(2)bipy (4 . H(2)O)]. X-ray structure analysis of 1 . 2H(2)O and 4. 8CH(3)OH revealed a pair Of V(3)O(13)N(4) trimeric units sharing two corners, with a centrosymmetric planar V(6)-core. In addition, a fully oxidized V(V) species [V(4)(V)O(8)(OCH(3))(2)(mu(3)-OCH(3))(2)(5,5'-me(2)bipy)(2)].3CH(3)OH (5 . 3CH(3)OH) was isolated from the reaction mixture used for the synthesis of 4 . H(2)O. The crystal structure of 5 . 3CH(3)OH revealed a dicubane-like framework with two missing vertices. Electron paramagnetic resonance (EPR) and variable temperature magnetic susceptibility studies for the hexamers 1 . 4 H(2)O and 3 . 4H(2)O showed the complete localization of the single 3d electrons on the V(IV) ions and unusual ferromagnetic interaction between the two paramagnetic vanadium(iv) ions separated by a distance of about 5.1 Angstrom. Furthermore, intermolecular antiferromagnetic interactions through pi-contacts of phenyl rings were observed for these species below 8 K. The ferromagnetic exchange coupling observed in the hexanuclear compounds 1.4H(2)O and 3.4 H(2)O is also discussed using ab initio UHF calculations on a model compound. The value of the exchange coupling constant (3.7 cm(-1)) for this model compound, calculated using the broken symmetry approach, is in good agreement, both in sign and magnitude, with the experimental J values (6.00 cm(-1) for 1.4H(2)O and 8.54 cm(-1) for 3.4H(2)O). | en |
| heal.publisher | Wiley-VCH Verlag | en |
| heal.journalName | Chemistry-a European Journal | en |
| heal.journalType | peer reviewed | - |
| heal.fullTextAvailability | TRUE | - |
| Appears in Collections: | Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Manos-2003-A new class of ferro.pdf | 485.26 kB | Adobe PDF | View/Open Request a copy |
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