Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(III) and Yb(III) in cyanide-bridged d-f assemblies (Articolo in rivista)

Type
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  • Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(III) and Yb(III) in cyanide-bridged d-f assemblies (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/b708683k (literal)
Alternative label
  • T. Lazarides; G. M. Davies; H. Adams; C. Sabatini; F. Barigelletti; A. Barbieri; S. J. A. Pope; S. Faulkner; M. D. Ward (2007)
    Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(III) and Yb(III) in cyanide-bridged d-f assemblies
    in Photochemical & photobiological sciences (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • T. Lazarides; G. M. Davies; H. Adams; C. Sabatini; F. Barigelletti; A. Barbieri; S. J. A. Pope; S. Faulkner; M. D. Ward (literal)
Pagina inizio
  • 1152 (literal)
Pagina fine
  • 1157 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 6 (literal)
Rivista
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  • In: Photochemical & Photobiological Sciences, vol. 2007 (6) pp. 1152 - 1157. RSC- The Royal Society of Chemistry, 2007. (literal)
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  • 11 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. CNR, ISOF, I-40129 Bologna, Italy 2. Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England 3. Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England 4. Cardiff Univ, Sch Chem, Cardiff CF10 3AT, S Glam, Wales (literal)
Titolo
  • Ligand-field excited states of hexacyanochromate and hexacyanocobaltate as sensitisers for near-infrared luminescence from Nd(III) and Yb(III) in cyanide-bridged d-f assemblies (literal)
Abstract
  • Crystallisation of [Co(CN)6]3- or [Cr(CN)6]3- with Ln(III) salts (Ln = Nd, Gd, Yb) from aqueous dmf afforded the cyanide-bridged d/f systems [Ln(dmf)4(H2O)3(µ-CN)Co(CN)5] (Co-Ln, discrete dinuclear species) and {[Cr(CN)4(µ-CN)2Ln(H2O)2(dmf)4]} (Cr-Ln, infinite cyanide-bridged chains with alternating Cr and Ln centres). With Ln = Gd the characteristic long-lived phosphorescence from d-d excited states of the [M(CN)6]3- units was apparent in the red region of the spectrum, with lifetimes of the order of 1 µs, since the heavy atom effect of the Gd(III) promotes inter-system crossing at the [M(CN)6]3- units to generate the phosphorescent spin-forbidden excited states. With Ln = Yb or Nd however, the d-block luminescence was completely quenched due to fast (108 s-1) energy-transfer to the Ln(III) centre, resulting in the characteristic sensitised emission from Yb(III) and Nd(III) in the near-IR region. For both Co-Nd and Co-Yb, calculations based on spectroscopic overlap between emission of the donor (Co) and absorption of the acceptor (Ln) suggest that the Dexter energy-transfer mechanism is responsible for the complete quenching that we observe. (literal)
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