Optimizing homologous alcohol oxidation: elucidating the impact of surfactant-alcohol hydrophobic interaction and micellar surface charge

IF 2.8 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Research on Chemical Intermediates Pub Date : 2024-12-02 DOI:10.1007/s11164-024-05461-9

Mousumi Layek, Sandip Kundu, Priya Karmakar, Sk Mehebub Rahaman, Trishna Mandal, Arnab Patra, Arindam Nandy, Manab Chakravarty, Pintu Sar, Bidyut Saha

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Abstract

Micelles, a unique structural arrangement, function as nano-dimensional vessels in organic reactions, facilitating numerous catalytic transformations in water. This comprehensive study aims to explore the potential impact of two anionic surfactants (sodium dodecylsulphate or SDS or SC₁₂S and sodium tetradecylsulphate or STS or SC₁₄S) having dissimilar alkyl chain lengths and the hydrophobicity of the aliphatic alcohols (propanol and pentanol) as well on the overall kinetic profile of the oxidation study. The SDS micellar medium significantly encourages the reaction rate compared to STS micellar media. In the case of aliphatic alcohols with varying hydrophobicity, the same kind of rate is observed as with surfactants: (k_obs)_SDS-Propanol ~ 13-folds > (k_obs)_SDS-Pentanol ~ 11-folds > (k_obs)_STS-Propanol ~ 2.4-folds > (k_obs)_STS-Pentanol ~ 2-folds. The rate of the reaction improves as the aliphatic alcohol and surfactant hydrophobicity reduces. Herein, the effectiveness of micellar catalysis is greatly influenced by the surface charge of the micelle and surfactant-alcohol hydrophobic interaction. The kinetic observations are elucidated with conductometry, fluorometry, UV–Vis spectroscopy, FT-IR, ¹H-NMR, DLS, FESEM, TEM, and Zeta potential analysis. The Piszkiewicz’s kinetic model has also been applied to enlighten the linear rate acceleration in both micellar media.

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优化同源醇氧化：阐明表面活性剂-醇疏水相互作用和胶束表面电荷的影响

胶束是一种独特的结构排列，在有机反应中起着纳米级容器的作用，促进了水中的许多催化转化。这项综合研究旨在探索两种阴离子表面活性剂（十二烷基硫酸钠或SDS或SC12S和十四烷基硫酸钠或STS或SC14S）具有不同的烷基链长度和脂肪醇（丙醇和戊醇）的疏水性以及对氧化研究的总体动力学特征的潜在影响。与STS胶束介质相比，SDS胶束介质显著提高了反应速率。对于疏水性不同的脂肪醇，其反应速率与表面活性剂相同：（kobs） sds -丙醇~ 13倍>；（kobs） sds -戊醇~ 11倍>；（kobs） sts -丙醇~ 2.4倍>；（kobs） sts -戊醇~ 2倍。随着脂肪醇和表面活性剂疏水性的降低，反应速率提高。胶束的表面电荷和表面活性剂与醇的疏水相互作用对胶束催化的效果有很大的影响。通过电导、荧光、紫外-可见光谱、红外光谱、核磁共振、DLS、FESEM、TEM和Zeta电位分析对动力学观察结果进行了验证。Piszkiewicz的动力学模型也被应用于两种胶束介质中的线性速率加速度。

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来源期刊

Research on Chemical Intermediates 化学-化学综合

CiteScore

5.70

自引率

18.20%

发文量

229

审稿时长

2.6 months

期刊介绍： Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.