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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Enantio selective room temperature phosphorescence detection of non-phosphorescent analytes based on interaction with beta-cyclodextrin/1-bromonaphthalene complexes
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Enantio selective room temperature phosphorescence detection of non-phosphorescent analytes based on interaction with beta-cyclodextrin/1-bromonaphthalene complexes

机译：基于与β-环糊精/ 1-溴萘配合物的相互作用，对非磷分析物进行对映体选择性室温磷光检测

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摘要

Menthol (MT) induces strong room temperature phosphorescence (RTP) of 1-bromonaphthalene (1BrN) in aqueous beta-cyclodextrin (beta-CD) suspensions, even under non-deoxygenated conditions. Interestingly, (-)-MT and (+)-MT enantiomers give rise to different phosphorescence intensities, the difference being 19 +/- 3%. It is argued that the signal can be mainly ascribed to the formation of ternary complexes beta-CD/ 1BrN/MT which show different RTP lifetimes, i.e. 4.28 +/- 0.06 and 3.71 +/- 0.06 ms for (-)-MT and (+)-MT, respectively. Most probably, the stereochemical structure of (-)-MT provides a better protection of 1BrN against quenching by oxygen than (+)-MT. This interpretation is in line with the observation that under deoxygenated conditions the phosphorescence intensity difference for the two complexes becomes very small, i.e. only about 4%.The lifetime difference under aerated conditions enables the direct determination of the NIT stereochemistry. For mixtures, in view of the 0.06 ms uncertainty in the lifetime, enantionteric purity can be determined down to 10%. Furthermore, in the case of NIT the concentration of the least abundant enantiomer should be at least 3 x 10(-4) M, since otherwise complex dissociation would obscure the lifetime difference. (c) 2004 Elsevier B.V. All rights reserved.
机译：薄荷醇（MT）会在水性β-环糊精（β-CD）悬浮液中诱导1-溴萘（1BrN）产生强烈的室温磷光（RTP），即使在非脱氧条件下也是如此。有趣的是，（-）-MT和（+）-MT对映异构体产生不同的磷光强度，差异为19 +/- 3％。据认为，该信号主要归因于三元复合物β-CD/ 1BrN / MT的形成，它们显示出不同的RTP寿命，即（-）-MT和（ +）-MT。与（+）-MT相比，（-）-MT的立体化学结构最有可能为1BrN防止氧猝灭提供更好的保护。这种解释与以下观察结果相符：在脱氧条件下，两种配合物的磷光强度差异变得很小，即只有约4％。在充气条件下的寿命差异可以直接确定NIT立体化学。对于混合物，鉴于使用寿命不确定性为0.06 ms，对映体纯度可确定为低至10％。此外，在NIT的情况下，最不丰富的对映异构体的浓度应至少为3 x 10（-4）M，因为否则复杂的解离将掩盖寿命差异。 （c）2004 Elsevier B.V.保留所有权利。

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