Pentanuclear complexes with unusual structural topologies from the initial use of two aliphatic amino-alcohol ligands in Fe chemistry
| dc.contributor.author | Kizas, C. M. | en |
| dc.contributor.author | Manos, M. J. | en |
| dc.contributor.author | Nastopoulos, V. | en |
| dc.contributor.author | Boudalis, A. K. | en |
| dc.contributor.author | Sanakis, Y. | en |
| dc.contributor.author | Tasiopoulos, A. J. | en |
| dc.date.accessioned | 2015-11-24T16:44:07Z | |
| dc.date.available | 2015-11-24T16:44:07Z | |
| dc.identifier.issn | 1477-9226 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/8774 | |
| dc.rights | Default Licence | - |
| dc.subject | single-molecule magnet | en |
| dc.subject | transition-metal clusters | en |
| dc.subject | high-spin molecules | en |
| dc.subject | ground-state | en |
| dc.subject | coordination polymers | en |
| dc.subject | family | en |
| dc.subject | iron | en |
| dc.subject | alkoxides | en |
| dc.subject | tetranuclear | en |
| dc.subject | relaxation | en |
| dc.title | Pentanuclear complexes with unusual structural topologies from the initial use of two aliphatic amino-alcohol ligands in Fe chemistry | en |
| heal.abstract | Five novel pentanuclear Fe3+ clusters with the aliphatic amino-alcohol ligands 3-amino-1-propanol (Hap) and 2-(hydroxymethyl)piperidine (Hhmpip) [Fe-5(mu(3)-O)(2)(L)(4)(O2CR)(7)] [L = ap(-), R = Ph (1); L = ap(-), R = C(CH3)(3) (2); L = hmpip(-), R = Ph (3); L = hmpip(-), R = C(CH3)(3) (4)] and [Fe-5(mu(4)-O)(mu(3)-O)-(O2CC(CH3)(3))(8)(ap)(2)Cl(HO2CC(CH3)(3))] (5) are reported. Compounds 1-4 were prepared from reactions of preformed trinuclear Fe3+ clusters with the ligands in a molar ratio 1 : 5 in MeCN (1, 3, 4) or DMF (2), whereas compound 5 was prepared from the reaction of FeCl3 with Hap in the presence of HO2CC(CH3)(3) in a molar ratio 1 : 3 : 2 in MeCN. To the best of our knowledge, 1-5 are the first examples of Fe3+ complexes with the ligands Hap and Hhmpip. The structures of 1-4 are composed of a quasi-planar [Fe-5(mu(3)-O)(2)](11+) core which consists of two vertex-sharing [Fe-3(mu(3)-O)](7+) triangles. The structure of 5 is based on the [Fe-5(mu(4)-O)(mu(3)-O)](11+) core, in which the five Fe3+ ions adopt a monocapped trigonal pyramidal topology. Variable-temperature magnetic susceptibility measurements on powdered microcrystalline samples of 1 and 5 revealed the existence of antiferromagnetic interactions which led to an S = 5/2 ground state. Mossbauer spectroscopy studies on powdered microcrystalline samples of 1 and 5 confirmed that all iron ions of both complexes are in the Fe3+ (S = 5/2) state. The variation of the ligand environment in the various iron sites was reflected in their different quadruple splitting parameters. At T < 50 K the Mossbauer spectra indicated the onset of spin relaxation effects in the time scale of the technique (10(-7)-10(-8) s). | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1039/C1dt11487e | - |
| heal.identifier.secondary | <Go to ISI>://000299054500019 | - |
| heal.identifier.secondary | http://pubs.rsc.org/en/Content/ArticleLanding/2012/DT/c1dt11487e | - |
| heal.journalName | Dalton Transactions | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2012 | - |
| heal.publisher | Royal Society of Chemistry | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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