A comparative photophysical investigation of styryl dye in cationic and anionic miceller environments

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-05-07 DOI:10.1016/j.molliq.2025.127732

Satvinder Kaur , Kanika Guleria , Debabrata Seth , Amulya Prasad Panda , Rabindranath Jana

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Abstract

In the present study, we examine the impact of micellization by ionic surfactants on the photophysical properties of a styryl dye, 4-[4(dimethylamino)styryl]pyridine (DMASP), through steady-state absorption, fluorescence emission, and time-resolved fluorescence emission measurements and DFT studies. The spectroscopic results reveal that the photophysical behavior of DMASP is significantly influence by the charge, structure of the surfactant head group, and length of the alkyl chain of the surfactants. The binding constant and partition coefficient values indicate a more favorable interaction of DMASP with cationic surfactant Cetyltrimethylammonium bromide (CTAB) compare to the anionic surfactant Sodium dodecyl sulfate (SDS). Moreover, the higher average decay time of DMASP in CTAB is attributed to the increased viscosity and more hydrophobic core of the CTAB micelle, compared to SDS micelle. DFT studies further support the greater stability of the DMASP-CTAB complex over the DMASP-SDS complex based on by binding energy calculation. These finding demonstrate that DMASP is highly sensitive to the micellar environment, suggesting its potential as a useful probe to understand the structure of different biological microenvironments.

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苯乙烯染料在阳离子和阴离子胶束环境下的光物理比较研究

在本研究中，我们通过稳态吸收、荧光发射、时间分辨荧光发射测量和DFT研究了离子表面活性剂胶束化对苯乙烯基染料4-[4（二甲氨基）苯乙烯基]吡啶（DMASP）光物理性质的影响。光谱结果表明，DMASP的光物理行为受电荷、表面活性剂头基结构和烷基链长度的显著影响。结合常数和分配系数值表明，DMASP与阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）的相互作用优于阴离子表面活性剂十二烷基硫酸钠（SDS）。此外，DMASP在CTAB中的平均衰减时间较长，这是由于CTAB胶束的粘度增加，与SDS胶束相比，CTAB胶束的疏水性更强。DFT研究进一步支持基于结合能计算的daspp - ctab配合物比daspp - sds配合物更稳定。这些发现表明DMASP对胶束环境高度敏感，这表明它有可能成为了解不同生物微环境结构的有用探针。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.