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首页> 外文期刊>Journal de Chimie Physique et de Physico-Chimie Biologique >Fluorescence quenching studies of tryptophan by trivalent lanthanide ions in aqueous media. Evidence for a lanthanide-induced intersystem crossing singlet-to-triplet mechanism
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Fluorescence quenching studies of tryptophan by trivalent lanthanide ions in aqueous media. Evidence for a lanthanide-induced intersystem crossing singlet-to-triplet mechanism

机译:三价镧系离子在水性介质中色氨酸的荧光猝灭研究。镧系元素诱导的系统间交叉单重态-三重态机制的证据

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摘要

The quenching of tryptophan fluorescence by trivalent lanthanide ions is studied at room temperature in aqueous non buffered (aH 5.8) and in 0.05 M HEPES aH 7.5 and acetate aH 5.8 buffered solutions. Bimolecular quenching rate constants ranged between 0.9 * 10~9 and 24.4 * 10~9 M~(-1)s~(-1) in HEPES buffer, and 1.8 * 10~9 and 20.7 * 10~9 in acetate buffer and between 2.0 * 10~9 and 22 * 10~9 M~(-1)s~(-1) in non buffered aqueous solution, according to the nature of the ions. A mechanism involving a lanthanide-induced intersystem crossing singlet-to-triplet process is proposed. The induced intersystem crossing rate constants (k_(isc)~(ind)) range from 2.0 * 10~7 to 4.7 * 10~7 M~(-1)s~(-1). In aqueous media, k_(isc)~(ind) are correlated with the molecular weight of the lanthanide ions under study.
机译:在室温下,在非缓冲水溶液(aH 5.8)和0.05 M HEPES aH 7.5和乙酸盐aH 5.8缓冲溶液中,研究了三价镧系元素对色氨酸荧光的猝灭。双分子猝灭速率常数在HEPES缓冲液中介于0.9 * 10〜9和24.4 * 10〜9 M〜(-1)s〜(-1)之间,在乙酸盐缓冲液中介于1.8 * 10〜9和20.7 * 10〜9之间根据离子的性质,在非缓冲水溶液中的浓度为2.0 * 10〜9和22 * 10〜9 M〜(-1)s〜(-1)。提出了一种涉及镧系元素诱导的系统间交叉单线到三重态过程的机制。诱导的系统间交叉速率常数(k_(isc)〜(ind))范围从2.0 * 10〜7到4.7 * 10〜7 M〜(-1)s〜(-1)。在水性介质中,k_(isc)〜(ind)与所研究的镧系元素离子的分子量相关。

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