Synthesis and Investigation of Surface Tension Properties of Fatty Pyrimidinium Betaines

Abstract:

A novel series of fatty betaines containing a pyrimidine ring with different alky chain lengths were synthesized by condensation of fatty N,N'-diphenylalkylamidines with a specific highly reactive malonic ester derivative under mild conditions. The chemical structures of products were characterized by common spectroscopic analyses (FTIR, mass spectra, ¹H NMR, and ¹³C NMR spectrometry). Equilibrium surface tension and conductivity as a function of concentration of dodecyl pyrimidinum betaine (betaine with a 12 -carbon alkyl chain) in ethanolic solutions were measured and the critical micelle concentration (CMC) was determined at 30 °C. The results showed that the critical micelle concentration (CMC) of dodecyl pyrimidinum betaine is 0.925 mmol/L and the corresponding surface tension (γ_CMC) is 25.38 mN/m respectively. These results revealed that the synthesized fatty pyrimidinium betaines are efficient amphoteric surfactants making them promising candidates for applications in a very large number of areas.

• Periodical: Engineering Chemistry (Volume 9)
• Pages: 53-60
• DOI: https://doi.org/10.4028/p-MxwzR2
• Online since: March 2025
• Authors: Malki Fatiha*, Missoum Amina, Hamza Kahina
• Keywords: Amphoteric Surfactant, Critical Micelle Concentration (CMC), Pyrimidinium Betaine, Surface Activity, Syntesis

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