Fluorescence Quenching of Dipyrenylalkanes by an Electron/Charge Acceptor,The Journal of Physical Chemistry B

当前位置： X-MOL 学术 › J. Phys. Chem. B › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Fluorescence Quenching of Dipyrenylalkanes by an Electron/Charge Acceptor
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-03-23 , DOI: 10.1021/acs.jpcb.0c00954
Siddharth Pandey ₁ , Harmeet Singh ₁ , Anita Yadav ₁ , Shreya Juneja ₁ , Vaishali Khokhar ₁ , Shruti Trivedi ₁

Affiliation

Compounds possessing two fluorophoric moieties may exhibit dual fluorescence, one characterizing the monomeric fluorophore unit and the other characterizing the intramolecular aggregate. Fluorescence quenching of two dipyrenylalkanes, 1,3-bis(1-pyrenyl)propane [1Py(3)1Py] and 1,10-bis(1-pyrenyl)decane [1Py(10)1Py] having different alkyl chains separating the two termini pyrenyl groups that are capable of forming an intramolecular excimer, by an electron/charge-accepting quencher, nitromethane, is investigated in four different solvents—nonpolar (cyclohexane (CH)), polar-aprotic (acetonitrile (ACN)), polar-protic (ethanol (EtOH)), and chlorinated (dichloromethane (DCM))—under ambient conditions. For a given probe in a solvent, fluorescence from the monomer and the intramolecular excimer are quenched with similar efficiencies; the efficiency of quenching is higher for the probe with the longer alkyl chain separating the two fluorophores. Quenching efficiency is significantly higher in chlorinated solvent DCM. The bimolecular quenching rate constants for intramolecular excimer, however, are either comparable or lower for the longer alkyl chain compound. It is suggested that, while the donor electronic excited-state energetics is more favorable for the long alkyl chain compound, the approach of the quencher to the intramolecular excimer appears to be hindered by the presence of a longer alkyl chain.

中文翻译：

电子/电荷受体对二苯乙烯基烷烃的荧光猝灭

具有两个荧光基团的化合物可表现出双重荧光，一种表征单体荧光团单元，另一种表征分子内聚集体。荧光猝灭两个二苯乙烯基烷烃，具有不同烷基链的1,3-双（1-吡啶基）丙烷[1Py（3）1Py]和1,10-双（1-吡啶基）癸烷[1Py（10）1Py]在四种不同的溶剂-非极性（环己烷（CH）），极性非质子传递性（乙腈（ACN）），极性-非极性溶剂中研究了能够通过电子/电荷猝灭剂硝基甲烷形成分子内准分子的末端pyr基质子（乙醇（EtOH））和氯化物（二氯甲烷（DCM））-在环境条件下。对于溶剂中的给定探针，单体和分子内准分子的荧光被猝灭，效率相似。较长的烷基链将两个荧光团隔开，因此探针的猝灭效率更高。在氯化溶剂DCM中，淬灭效率明显更高。然而，对于分子内准分子的双分子猝灭速率常数对于较长的烷基链化合物而言是相当的或更低的。有人提出，尽管供体电子激发态能量对长烷基链化合物更有利，但较长烷基链的存在似乎阻碍了淬灭剂接近分子内准分子。对于较长的烷基链化合物而言是可比的或更低的。有人提出，尽管供体电子激发态能量对长烷基链化合物更有利，但较长烷基链的存在似乎阻碍了淬灭剂接近分子内准分子。对于较长的烷基链化合物而言是可比的或更低的。有人提出，尽管供体电子激发态能量对长烷基链化合物更有利，但较长烷基链的存在似乎阻碍了淬灭剂接近分子内准分子。

更新日期：2020-03-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文