On the Mechanism of d-f Energy Transfer in Ru-II/Ln(III) and Os-II/Ln(III) Dyads: Dexter-Type Energy Transfer Over a Distance of 20 angstrom
Φόρτωση...
Ημερομηνία
Συγγραφείς
Lazarides, T.
Sykes, D.
Faulkner, S.
Barbieri, A.
Ward, M. D.
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Τίτλος τόμου
Εκδότης
Wiley-VCH Verlag
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Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Chemistry-a European Journal
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Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
We have used time-resolved luminescence methods to study rates of photoinduced energy transfer (PEnT) from [M(biPY)(3)](2+) (M=Ru, Os) chromophores to Ln(III) ions with low-energy f-f states (Ln=Yb, Nd, Er) in d-f dyads in which the metal fragments are separated by a saturated -CH2CH2- spacer, a P-C6H4 spacer, or a p-(C6H4)(2) spacer. ne finding that clef PEnT is much faster across a conjugated P-C6H4 spacer than it is across a shorter CH2CH2 spacer points unequivocally to Dexter-type energy transfer, involving electronic coupling mediated by the bridging ligand orbitals (superexchange) as the dominant mechanism. Comparison of the distance dependence of the Ru -> Nd energy-transfer rate across different conjugated spacers [P-C6H4 or P-(C6H4)(2) groups] is also consistent with this mechanism. Observation of Ru -> Nd PEnT (as demonstrated by partial quenching of the Ru-II-based (MLCT)-M-3 emission (MLCT= metal-to-ligand charge transfer), and the growth of sensitised Nd-III-based emission at 1050nm) over approximately 20 angstrom by an exchange mechanism is a departure from the normal situation with lanthanides, in which long-range energy transfer often involves through-space Coulombic mechanisms.
Περιγραφή
Λέξεις-κλειδιά
bridging ligands, energy transfer, lanthanides, luminescence, osmium, ruthenium, near-infrared luminescence, coordination-compounds, dinuclear complexes, photophysical properties, electronic excitation, binuclear complexes, quantum yields, yb-iii, emission, sensitization
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Σύνδεσμος
<Go to ISI>://000260703900034
http://onlinelibrary.wiley.com/store/10.1002/chem.200800600/asset/9389_ftp.pdf?v=1&t=hmriafzi&s=b37d7d8fc4f260dd56d954f92f75516416b884e5
http://onlinelibrary.wiley.com/store/10.1002/chem.200800600/asset/9389_ftp.pdf?v=1&t=hmriafzi&s=b37d7d8fc4f260dd56d954f92f75516416b884e5
Γλώσσα
en
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Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας