Heterometallic Fe-III-Ce-IV complexes from the use of aliphatic aminoalcohol ligands
Φόρτωση...
Ημερομηνία
Συγγραφείς
Kizas, C. M.
Papatriantafyllopoulou, C.
Manos, M. J.
Tasiopoulos, A. J.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Polyhedron
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Six novel heteronuclear Fe-III/Ce-IV clusters with the ligands 3-amino-1-propanol (Hap) and 2-(hydroxymethyl)piperidine (Hhmpip) [(Fe4Ce6O8)-Ce-III-O-IV(L)(4)((CH3)(3)CCO2)(12)(RCO2)(4)] = CH3, L = ap(-), 1; R = ClCH2, L = ap(-), 2; R = BrCH2, L = ap(-), 3; R = C2H5, L = ap(-), 4; R = CH3, L = hmpip(-), 5) and aFe(2)Ce(2)Na(2)O(2) ((CH3)(3)CCO2)(8)(N-3)(2)(aP)(2)])(infinity). (6)(infinity) are reported. Compounds 1-5 were prepared from reactions of preformed trinuclear Fe3+ clusters with the ligands, in the presence of (NH4)(2)Ce(NO3)(5) and RCO2M (R = CH3, M+ = H+, 1; R = ClCH2, M+ = Na+, 2; R = BrCH2, M+ = Na+, 3; R = CH3CH2, M+ = Na+, 4; R = CH3, M+ = H+, 5) in 1:5:1:1 molar ratio in CH3CN. Complex (6 center dot 2CH(3)CN)(infinity) was prepared by a similar to the above described synthetic procedure that involved the use of NaN3 instead of RCO2M. To the best of our knowledge, compounds 1-6 are the initial examples of Fe-III/Ce-IV species and rare examples of metal complexes with the ligands Hap and Hhmpip. The structures of 1-5 are composed of a distorted supertetrahedral [(Fe4Ce6IV)-Ce-III(mu(4)-O)(4)(mu(3)-O)(4)](20+) structural core, while (6 center dot 2CH(3)CN)(infinity) displays a [(Fe2Ce2Na2)-Ce-III-Na-IV(mu(4)-O)(2)](12+) core consisting of two tetrahedral units sharing one common edge. These two structural types are rather uncommon for mixed metal 3d/4f compounds although they are well-known for 3d metal cluster chemistry. Variable temperature dc magnetic susceptibility studies on powdered microcrystalline samples of 1 and (6 center dot 2CH(3)CN)(infinity), revealed the presence of weak antiferromagnetic interactions as expected on the basis of the large separations (>6 angstrom) between the paramagnetic Fe3+ ions in both complexes. (C) 2012 Elsevier Ltd. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
iron(iii) clusters, cerium(iv) clusters, 3d-4f clusters, aliphatic aminoalcohols, crystal structures, magnetic properties, single-molecule magnets, fe-57 mossbauer-spectroscopy, metal-lanthanide complexes, high-spin molecules, high-nuclearity, ground-state, susceptibility measurements, coordination polymers, cluster chemistry, oxidation-states
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000318747100042
http://ac.els-cdn.com/S0277538712006808/1-s2.0-S0277538712006808-main.pdf?_tid=6d1a5b26-3636-11e3-b216-00000aacb362&acdnat=1381909493_186e2b7a480fca8015e3292a20bdf735
http://ac.els-cdn.com/S0277538712006808/1-s2.0-S0277538712006808-main.pdf?_tid=6d1a5b26-3636-11e3-b216-00000aacb362&acdnat=1381909493_186e2b7a480fca8015e3292a20bdf735
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας