Non-Radiative Deactivation of the Excited States of Europium, Terbium and Ytterbium Complexes by Proximate Energy-Matched OH, NH and CH Oscillators: an Improved Luminescence Method for Establishing Solution Hydration States
Published In
Journal of the Chemical Society
Document Type
Citation
Publication Date
1999
Abstract
The radiative rate constants for depopulation of the excited states of closely-related series of anionic, neutral and cationic europium, terbium and ytterbium complexes have been measured in H2O and D2O. With the aid of selective ligand deuteriation, the relative contributions of OH, NH (both amide and amine) and CH oscillators have been measured and critically assessed. Quenching of the Eu 5D0 excited state by amine NH oscillators is more than twice as efficient as OH quenching. The importance of the distance between the excited Ln ion and the XH oscillator is described with recourse to published crystallographic information. The general equation, q = A′(ΔkH2O–kD2O)corr is presented and revised values of A′ for Eu (1.2 ms), Tb (5 ms) and Yb (1 µs) given, which allow for the quenching contribution of closely diffusing OH oscillators. The relevance of such studies to the hydration state of certain gadolinium complexes is described and clear evidence provided for a break in hydration at gadolinium.
Rights
Copyright (1999) RSC
Locate the Document
DOI
10.1039/A808692C
Persistent Identifier
https://archives.pdx.edu/ds/psu/36520
Citation Details
Clarkson, I., Dickins, R., & de Sousa, A. (1999). Non-radiative deactivation of the excited states of europium, terbium and ytterbium complexes by proximate energy-matched OH, NH and CH oscillators: an improved luminescence method for establishing solution hydration states. Journal of the Chemical Society, Perkin Transactions 2, (3), 493-504.
Description
*At the time of publication, Mark Woods was affiliated with the University of Durham.