A promising hydrotropic effect of Tetra n-octyl ammonium bromide (TOAB) for thermodynamic investigation of surface tension, conductivity of indole in water

Analytical Chemistry Letters Pub Date : 2023-07-04 DOI:10.1080/22297928.2023.2256339

S. Vhatkar, Kumar Abhisek, Helen Treasa Mathew, Ramesh Oraon

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Abstract

Abstract Hydrotropes are a class of compounds that improve aqueous solubility of certain organic compounds. The aqueous solubility arising from interfacial incompatibility has been a critical industrial concern, limiting various applications. Among many such hydrotropes, the purpose of this work is to study the effect of n-octyl tetra ammonium bromide (TOAB) over the organic-inorganic incompatibility of an indole water system experimentally through conductometry and stalagmometry, for the first time. The study focussed on conductometry to determine minimum hydrotrope concentration (MHC) through specific conductivity at different temperatures. The MHC is essential in ensuring the spontaneous self-assembly of organic molecules (such as indole) in water systems. In addition to this, MHC was also determined using stalagmometry at room temperature to analyse the hydrotropic effect of TOAB. Consequently, the Hydrotropy-assisted cooperative solubilization of indole in water was investigated by specific conductivity (7.64 µs/cm), surface tension (40.29 mN/m) and Gibb’s free energy at the minimum hydrotrope concentration (MHC∼ 0.95 mM) at room temperature. In conclusion, the experimental observation over the MHC is in good agreement with thermodynamic studies, suggesting the promising nature of TOAB in improving the aqueous solubility of Indole in water. GRAPHICAL ABSTRACT

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四正辛基溴化铵（TOAB）对吲哚在水中的表面张力和电导率的热力学研究具有良好的亲水效应

摘要水溶解剂是一类能提高某些有机化合物水溶性的化合物。由于界面不相容而产生的水溶性一直是工业上的一个重要问题，限制了各种应用。在众多此类水相催化剂中，本研究的目的是首次通过电导测量法和石笋测量法，实验研究正辛基四溴化铵（TOAB）对吲哚水体系的有机-无机不相容性的影响。研究重点是通过电导率测定不同温度下的比电导率来确定最低水胶浓度（MHC）。MHC 对确保有机分子（如吲哚）在水系统中的自发自组装至关重要。除此以外，还在室温下使用石笋测量法测定了 MHC，以分析 TOAB 的亲水效应。因此，在室温下，通过比电导率（7.64 µs/cm）、表面张力（40.29 mN/m）和最小触媒浓度（MHC∼ 0.95 mM）下的吉布斯自由能，研究了触媒辅助吲哚在水中的协同增溶作用。总之，在 MHC 上的实验观察结果与热力学研究结果十分吻合，这表明 TOAB 在提高吲哚的水溶性方面大有可为。图表摘要

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来源期刊

Analytical Chemistry Letters

CiteScore

2.30

自引率

0.00%

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