Photoinduced energy transfer between Re(I) and Ru(II) termini connected through a new exo-ditopic bis-phenanthroline ligand fused to a central macrocycle spacer: Synthesis, structure, and electrochemical and photophysical properties of a heterodinuclear complex
Φόρτωση...
Ημερομηνία
Συγγραφείς
Lazarides, T.
Barbieri, A.
Sabatini, C.
Barigelletti, F.
Adams, H.
Ward, M. D.
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
Inorganica Chimica Acta
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
A new ligand L-1 has been prepared in which two 1,10-phenanthroline fragments are separated by an 18-crown-6 macrocyclic spacer. This was used to prepare the heterodinuclear complex [(bipy)(2)Ru(mu-L-1)Re(CO)(3)Cl][PF6](2) [Ru(L-1)Re] in which the {Ru(bipy)(2)(phen)}(2+) and {Re(CO)Cl(phen)} chromophores are separated by a saturated and fairly flexible crown-ether fragment. On the basis of photophysical studies on Ru(L-1)Re and associated mononuclear Ru(II) and Re(I) complexes, Re -> Ru photoinduced energy-transfer occurs with a rate constant of 1.9 x 10(8) s(-1) in solution room temperature leading to near-complete quenching of the Re(I)-based luminescence. At 77 K the Re(I)-based luminescence component is completely quenched. Calculations on the efficiency of both Forster and Dexter energy-transfer as a function of (ReRu)-Ru-... distance in this system suggest that a folded conformation of the complex, in which the (ReRu)-Ru-... separation is much shorter than that implied by the extended conformation detected crystallographically, is responsible for the energy-transfer, since neither Forster nor Dexter Re -> Ru energy-transfer should be possible with the complex in an extended conformation. Addition of K+ or Ba2+ salts to solutions of Ru(L-1)Re had no effect on the photophysical properties, probably because the association constants are too low to give significant metal-ion binding in the macrocycle at the low concentrations employed. (c) 2006 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
ruthenium, rhenium, photophysics, bridging ligand, phenanthroline, spectroscopy, energy-transfer, intramolecular electron, polypyridine complexes, quaterpyridine ligand, dinuclear complex, charge separation, metal-complexes, quantum yields, luminescent, chromophores, porphyrin
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000244364600011
http://ac.els-cdn.com/S0020169306002520/1-s2.0-S0020169306002520-main.pdf?_tid=f02aab1c-34b3-11e3-8c42-00000aab0f27&acdnat=1381743498_6983d70f685fd0610090e011785184f4
http://ac.els-cdn.com/S0020169306002520/1-s2.0-S0020169306002520-main.pdf?_tid=f02aab1c-34b3-11e3-8c42-00000aab0f27&acdnat=1381743498_6983d70f685fd0610090e011785184f4
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