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Aggregation Behavior and Thiol-Thioester Exchange for Cationic Surfactants with Propylthioacetate Side Chain
Tsuyoshi Asakawa1, Nao Arai1, Akina Fujii1
1School of Chemistry, College of Science and Engineering, Kanazawa University.
Journal of Oleo Science
|July 18, 2018
Summary
New cationic surfactants with thioacetate groups were synthesized and studied. These surfactants exhibit lower critical micelle concentrations and can be converted into thiol or gemini surfactants under specific conditions.
Area of Science:
- Surface and Colloid Science
- Organic Synthesis
- Supramolecular Chemistry
Background:
- Cationic surfactants are essential in various chemical applications.
- Thioacetate functional groups offer unique reactivity for surfactant modification.
- Understanding surfactant behavior in aqueous solutions is crucial for developing new materials.
Purpose of the Study:
- To synthesize and characterize novel cationic surfactants containing the thioacetate group (Cn3SAc).
- To investigate the self-assembly properties and critical micelle concentrations (CMCs) of Cn3SAc surfactants.
- To explore the chemical transformations of Cn3SAc into thiol (Cn3SH) and gemini (2Cn3SS) surfactants.
Main Methods:
- Synthesis of CnH2n+1N(CH3)2(CH2)3SCOCH3] Cl (Cn3SAc) surfactants.
- Investigation of aqueous solution properties using conductivity, fluorescence, and dynamic light scattering.
- Chemical conversion of thioacetate surfactants using dithiothreitol (DTT) and NaOH.
- Analysis of reaction products using High-Performance Liquid Chromatography (HPLC) and Nuclear Magnetic Resonance (NMR) spectroscopy.
Main Results:
- Cn3SAc surfactants showed significantly lower CMCs compared to analogous alkyltrimethylammonium chlorides.
- Thioacetate group elimination was achieved using DTT and NaOH.
- Addition of DTT resulted in the formation of thiol surfactants (Cn3SH) via thiol-thioester exchange.
- Alkaline treatment and air oxidation led to the formation of gemini surfactants (2Cn3SS).
Conclusions:
- The synthesized Cn3SAc surfactants possess favorable micellar properties.
- The thioacetate group serves as a versatile precursor for generating thiol and gemini surfactants.
- This study presents a novel pathway for designing and functionalizing cationic surfactants for diverse applications.
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