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

被引：1414

作者：

Beeby, A ^{[1
]}

Clarkson, IM ^{[1
]}

Dickins, RS ^{[1
]}

Faulkner, S ^{[1
]}

Parker, D ^{[1
]}

Royle, L ^{[1
]}

de Sousa, AS ^{[1
]}

Williams, JAG ^{[1
]}

Woods, M ^{[1
]}

机构：

[1] Univ Durham, Dept Chem, Durham DH1 3LE, England

来源：

JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 1999年 / 03期

关键词：

D O I：

10.1039/a808692c

中图分类号：

O62 [有机化学];

学科分类号：

070303 [有机化学]; 081704 [应用化学];

摘要：

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 D-5(0) 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'(Delta k(H2O)-k(D2O))(corr) is presented and revised values of A' for Eu (1.2 ms), Tb (5 ms) and Yb (1 mu s) 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.

引用

页码：493 / 503

页数：11

共 58 条

[1]

Synthesis, NMR, relaxometry and circularly polarised luminescence studies of macrocyclic monoamidetris(phosphinate) complexes bearing a remote chiral centre [J].