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Survey of factors determining the circularly polarised luminescence of macrocyclic lanthanide complexes in solution

Bruce, James I.; Parker, David; Lopinski, Stefan and Peacock, Robert D. (2002). Survey of factors determining the circularly polarised luminescence of macrocyclic lanthanide complexes in solution. Chirality, 14(7) pp. 562–567.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1002/chir.10092
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Abstract

The development of emissive lanthanide complexes as structural or reactive probes to signal changes in their local chiral or ionic environment has been inhibited by the lack of understanding of correlating structural and electronic spectral information. The definition of relatively rigid enantiopure macrocyclic lanthanide complexes, whose inter- and intramolecular exchange dynamics have been defined, offers scope for remedying this situation. Chiral axially symmetric lanthanide complexes in solution give rise to large emission dissymmetry values (gem) in CPL spectra. The sign and magnitude of gem are determined by the degree of twist about the principal axis, which is predicted to be a maximum at ±22.5°, and by the site symmetry and local ligand field. In particular, the polarisability of the ligand donor atoms, especially for any axial donor, is very important. Examples of each case are discussed for structurally related cationic Eu(III) complexes.

Item Type: Journal Article
ISSN: 0899-0042
Keywords: europium; polarisation; emission; helicity; square-antiprism; coordination; enantiopure
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Biomedical Research Network (BRN)
Item ID: 3800
Depositing User: James Bruce
Date Deposited: 30 Jun 2006
Last Modified: 07 Mar 2014 13:46
URI: http://oro.open.ac.uk/id/eprint/3800
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