Exploring the intrinsic role of anions on Eu(III) coordination with aliquat based ionic liquids by luminescence spectroscopy

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-10-08 DOI:10.1016/j.molliq.2025.128605

Alok Rout , Satendra Kumar , Nagarajan Ramanathan

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引用次数: 0

Abstract

Ionic Liquid (IL) anion plays a vital role in the metal ion coordination process. In this report, two well-known IL extractants: methyltrioctylammonium nitrate ([N₁₈₈₈][NO₃]) and methyltrioctylammonium thiocyanate ([N₁₈₈₈][SCN]) were used to understand Eu(III) coordination through fluorescence spectroscopy in diverse experimental conditions. The main agenda of the investigation was to realize the role of NO₃⁻ and SCN⁻ ion both in feed and extracting phase during the solvent extraction process and the fundamental differences in Eu(III) coordination process in these ILs were analyzed based on the extraction and fluorescence results. Eu(III) emission in IL phase was remarkably higher at a high nitrate ion source (used as the salting-out agent) in the feed phase as compared to that without the presence of salting-out agent. The insignificant emission patterns observed in [N₁₈₈₈][SCN] as compared to that in [N₁₈₈₈][NO₃] were explored based on the quenching and coordination ability of SCN⁻ ion. The derived fluorescence parameters in the bi-phases were evaluated to realize the effectiveness and nature of Eu(III)---IL complex formation. The impact of IL cation and the nature of the feed aqueous phase on the excitation patterns of Eu(III) was also ascertained and reported in the paper.

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用发光光谱法探讨阴离子在Eu（III）与液相基离子液体配位中的内在作用

离子液体阴离子在金属离子配位过程中起着至关重要的作用。本报告采用两种著名的IL萃取剂：甲基三辛基硝酸铵（[N1888][NO3]）和甲基三辛基硫氰酸铵（[N1888][SCN]），在不同的实验条件下通过荧光光谱研究Eu（III）的配位。研究的主要目的是了解溶剂萃取过程中NO3 -和SCN -离子在进料相和萃取相中的作用，并根据萃取和荧光结果分析这两种il中Eu（III）配位过程的根本差异。在进料相高硝酸盐离子源（用作盐析剂）下，Eu（III）在IL相的排放量明显高于不添加盐析剂的情况。基于SCN−离子的猝灭和配位能力，探讨了[N1888][SCN]与[N1888][NO3]相比，在[N1888][SCN]中观察到的不明显的发射模式。对衍生的双相荧光参数进行了评估，以了解Eu（III）—IL络合物形成的有效性和性质。本文还确定并报道了IL阳离子和进料水相性质对Eu（III）激发模式的影响。

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.