Insights into spectrofluorimetric analysis in deep eutectic solvents

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2026-04-01 Epub Date: 2026-02-02 DOI:10.1016/j.molliq.2026.129325

Zeliha Akçin, Tuğçe Emre, Orhan Gezici

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Abstract

Deep eutectic solvents (DESs) have recently attracted considerable attention as tunable liquid media capable of modulating the photophysical behavior of dissolved species. In this study, the fluorescence characteristics of Rhodamine B were systematically investigated in two model DESs—choline chloride/urea (DES-U) and choline chloride/ethylene glycol (DES-E)—and their aqueous mixtures. The results demonstrate that DES composition and water content exert a pronounced influence on fluorescence intensity, emission wavelength, detection limits, and dynamic linear ranges. Compared to water, DES-based systems generally enhance fluorescence response, induce bathochromic shifts, and provide lower limit of detection, albeit with narrower linear dynamic ranges. These effects are attributed primarily to solvent-controlled protonation–deprotonation equilibria and aggregate formation arising from the unique microenvironments of DESs. The findings highlight the potential of DESs as designable media for fluorescence-based analytical applications.

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深入了解光谱荧光分析在深共晶溶剂

深共晶溶剂作为一种能够调节溶解物质的光物理行为的可调液体介质，近年来引起了人们的广泛关注。本研究系统地研究了罗丹明B在两种dess模型——氯化胆碱/尿素（DES-U）和氯化胆碱/乙二醇（DES-E）及其水溶液混合物中的荧光特性。结果表明，DES的组成和含水量对荧光强度、发射波长、检出限和动态线性范围有显著影响。与水相比，基于des的系统通常增强荧光响应，诱导色移，并提供较低的检测限，尽管线性动态范围较窄。这些影响主要归因于溶剂控制的质子-去质子平衡和由DESs独特微环境引起的聚集体形成。这些发现突出了DESs作为基于荧光的分析应用的可设计介质的潜力。

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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.