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
| dc.contributor.author | Lazarides, T. | en |
| dc.contributor.author | Davies, G. M. | en |
| dc.contributor.author | Adams, H. | en |
| dc.contributor.author | Sabatini, C. | en |
| dc.contributor.author | Barigelletti, F. | en |
| dc.contributor.author | Barbieri, A. | en |
| dc.contributor.author | Pope, S. J. A. | en |
| dc.contributor.author | Faulkner, S. | en |
| dc.contributor.author | Ward, M. D. | en |
| dc.date.accessioned | 2015-11-24T16:41:00Z | |
| dc.date.available | 2015-11-24T16:41:00Z | |
| dc.identifier.issn | 1474-905X | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/8350 | |
| dc.rights | Default Licence | - |
| dc.subject | transition-metal complexes | en |
| dc.subject | visible-light sensitization | en |
| dc.subject | lanthanide energy-transfer | en |
| dc.subject | one-dimensional chain | en |
| dc.subject | photophysical properties | en |
| dc.subject | er(iii) complexes | en |
| dc.subject | magnetic-properties | en |
| dc.subject | crystal-structures | en |
| dc.subject | extended arrays | en |
| dc.subject | d-block | en |
| dc.title | 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 | en |
| heal.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)(mu-CN)Co(CN)(5)] (Co-Ln, discrete dinuclear species) and {[Cr(CN)(4)(mu-CN)(2)Ln(H2O)(2)(dmf)(4)]}(infinity) (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 mu s, 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 (> 10(8) 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. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1039/B708683k | - |
| heal.identifier.secondary | <Go to ISI>://000250589200011 | - |
| heal.identifier.secondary | http://pubs.rsc.org/en/Content/ArticleLanding/2007/PP/b708683k | - |
| heal.journalName | Photochemical & Photobiological Sciences | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2007 | - |
| heal.publisher | Royal Society of Chemistry | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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