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

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dc.contributor.authorLazarides, T.en
dc.contributor.authorBarbieri, A.en
dc.contributor.authorSabatini, C.en
dc.contributor.authorBarigelletti, F.en
dc.contributor.authorAdams, H.en
dc.contributor.authorWard, M. D.en
dc.date.accessioned2015-11-24T16:44:48Z
dc.date.available2015-11-24T16:44:48Z
dc.identifier.issn0020-1693-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/8837
dc.rightsDefault Licence-
dc.subjectrutheniumen
dc.subjectrheniumen
dc.subjectphotophysicsen
dc.subjectbridging liganden
dc.subjectphenanthrolineen
dc.subjectspectroscopyen
dc.subjectenergy-transferen
dc.subjectintramolecular electronen
dc.subjectpolypyridine complexesen
dc.subjectquaterpyridine liganden
dc.subjectdinuclear complexen
dc.subjectcharge separationen
dc.subjectmetal-complexesen
dc.subjectquantum yieldsen
dc.subjectluminescenten
dc.subjectchromophoresen
dc.subjectporphyrinen
dc.titlePhotoinduced 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 complexen
heal.abstractA 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.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.ica.2006.04.029-
heal.identifier.secondary<Go to ISI>://000244364600011-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0020169306002520/1-s2.0-S0020169306002520-main.pdf?_tid=f02aab1c-34b3-11e3-8c42-00000aab0f27&acdnat=1381743498_6983d70f685fd0610090e011785184f4-
heal.journalNameInorganica Chimica Actaen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2007-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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