Comparison of the enantioselective quenching of the luminescence of Dy(III) and Tb(III) tris complexes of 2,6-pyridinedicarboxylate by resolved Ru(1,10-phenanthroline) < inf> 3 < sup> 2+

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Comparison is made between the enantioselective excited-state quenching of optically active tris-terdentate D3 complexes of Tb(III) and Dy(III) with 2,6-pyridinedicarboxylate by resolved Ru(1,10-phenanthroline)32+. It is found that the enantioselective quenching of the two species display almost identical dependence on temperature and solvent composition. The quenching is discussed within the contexts of a simple model involving encounter pair formation, reorientation, and energy transfer. From the results given, it is concluded that the enantioselectivity in the quenching does not depend significantly upon the nature of the chiral electronic states of the donor lanthanide ions but rather has its origin in stereochemical structural aspects of the encounter pair formed between the oppositely charged chiral complexes. © 1993 American Chemical Society.

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Journal of Physical Chemistry