TY - JOUR
T1 - Non-radiative deactivation of the excited states of europium, terbium and ytterbium complexes by proximate energy-matched OH, NH and CH oscillators
T2 - An improved luminescence method for establishing solution hydration states
AU - Beeby, Andrew
AU - Clarkson, Ian M.
AU - Dickins, Rachel S.
AU - Faulkner, Stephen
AU - Parker, David
AU - Royle, Louise
AU - De Sousa, Alvaro S.
AU - Williams, J. A.Gareth
AU - Woods, Mark
PY - 1999/3
Y1 - 1999/3
N2 - 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 liuand 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.
AB - 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 liuand 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.
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U2 - 10.1039/a808692c
DO - 10.1039/a808692c
M3 - Article
AN - SCOPUS:0041322026
SN - 0300-9580
SP - 493
EP - 503
JO - Journal of the Chemical Society. Perkin Transactions 2
JF - Journal of the Chemical Society. Perkin Transactions 2
IS - 3
ER -