Striking Solvent Dependence Of Total Emission And Circularly Polarised Luminescence In Coordinatively Saturated Chiral Europium Complexes: Solvation Significantly Perturbs The Ligand Field
PHYSICAL CHEMISTRY CHEMICAL PHYSICS(2021)
Abstract
Examination of total emission and circularly polarised luminescence (CPL) spectra of three 9-coordinate Eu(iii) complexes with well-defined speciation shows that the ligand fields of these C-3 symmetric complexes are extremely sensitive to solvent polarity, even when solvent is not present in the first coordination sphere. The energies, intensities, and (for CPL) the sign of some transitions vary with solvent polarity. These observations are rationalised by analysis of the factors that control total and circularly polarised emission, and have important implications for design of responsive luminescent Ln(iii) probes.
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Key words
chiral europium complexes,luminescence,ligand field
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