Reaction of the Biheteroaromatic Ligand 2-(2'-Pyridyl)Quinoxaline (L) with Zinc(Ii) and Cadmium(Ii) Halides - Preparation and Characterization of the 1/1 Complexes
Φόρτωση...
Ημερομηνία
Συγγραφείς
Perlepes, S. P.
Kasselouri, S.
Garoufis, A.
Lutz, F.
Bau, R.
Hadjiliadis, N.
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
The reactions of ZnX(2) and CdX(2) (X = Cl, Br, I) with the biheteroaromatic ligand 2-(2'-pyridyl)quinoxaline (L) were studied in ethanolic solutions. The new complexes [ZnX(2)L] (X = Cl, Br, I), [CdI(2)L] and [Cd(2)X(4)L(2)] were isolated and characterized by elemental analyses, conductivity measurements, X-ray powder patterns, thermal methods (TG/DTG, DTA) and spectroscopic (IR, far-IR, Raman, H-1 NMR) studies. The X-ray crystal structure of [ZnCl(2)L] . 0.5MeOH shows a distorted tetrahedral geometry around the zinc(II) atom. The ligand L acts as a bidentate chelate with the ligated atoms being the pyridine nitrogen and one of the quinoxaline nitrogens. A monomeric pseudo-tetrahedral structure is also assigned for [ZnBr2] and [MI(2)L] (M = Zn, Cd). Dimeric structures are proposed for the chloro and bromo cadmium(II) compounds, in which the two metal centres are bridged by two halo ligands, with a terminal halide and a chelating molecule of L completing five-coordination at each metal. All data are discussed in terms of the nature of bonding and known and assigned structures. A complex with the empirical formula Cd(2)Cl(4)L was isolated during the thermal decomposition of [Cd(2)Cl(4)L(2)]; the vibrational study of this thermally stable intermediate shows that L acts as a tridentate bridging ligand. The crystal structure of [Hg(2)Br(4)L(2)], which was not available when the results of the HgX(2)/L chemistry had been published, is also described.
Περιγραφή
Λέξεις-κλειδιά
crystal-structure, metal-complexes, coordination-compounds, molecular-structures, spectra, copper(i), chemistry
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://A1995RB57400009
http://ac.els-cdn.com/0277538794004128/1-s2.0-0277538794004128-main.pdf?_tid=c73763ffe377d6f3a51622634f23f16d&acdnat=1333029327_ccf4dfccc2b613b2de62257e8fca2d3f
http://ac.els-cdn.com/0277538794004128/1-s2.0-0277538794004128-main.pdf?_tid=c73763ffe377d6f3a51622634f23f16d&acdnat=1333029327_ccf4dfccc2b613b2de62257e8fca2d3f
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