Neil, E.R. and Fox, M.A. and Pal, R. and Pålsson, L.O. and O'Sullivan, B.A. and Parker, D. (2015) 'Chiral probe development for circularly polarised luminescence : comparative study of structural factors determining the degree of induced CPL with four heptacoordinate europium(III) complexes.', Dalton transactions., 44 (33). pp. 14937-14951.
A series of bright, europium(III) complexes has been prepared based on an achiral heptadentate triazacyclononane ligand bearing two strongly absorbing, coordinated aralkynyl pyridyl moieties. The binding of chiral carboxylates, including α-hydroxy acids such as lactate and mandelate, has been monitored by emission spectroscopy and is signalled by the switching on of strong circularly polarised emission. In each case, an R-chiral carboxylate gave rise to emission typical of a Δ complex, most clearly shown in the form of the ΔJ = 4 transition manifold around 700 nm. Variations in the sign and magnitude of the CPL allow the enantiomeric purity and absolute configuration of the acid to be assessed in a sample. Analysis of the relative energies of the parent aqua complexes and their stereoisomeric adducts has been aided by lifetime measurements and density functional theory calculations.
|Full text:||(AM) Accepted Manuscript|
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|Publisher Web site:||http://dx.doi.org/10.1039/c5dt02358k|
|Date accepted:||24 July 2015|
|Date deposited:||28 September 2015|
|Date of first online publication:||September 2015|
|Date first made open access:||24 July 2016|
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