A series of cationic gemini surfactants, N,N′-bis­(alkyl)-N,N′-bis­(2-hydroxypropyl)­ethylenediammonium dibromide, [C n H2n+1(CH3CH­(OH)­CH2)­NH­(CH2)2NH­(CH2CH­(OH)­CH3)­C n H2n+1]­Br2 (where n is the tail chain length, n = 9, 12, and 14), referred to as C n C2C n [iso-Pr­(OH)] was synthesized. Via conductometric and tensiometric methods, at different temperatures (283 to 313 K), specific electrical conductivities and surface tensions of the aqueous solutions of these cationic gemini surfactants were determined. According to the obtained values, micellization and adsorption parameters such as critical micellization concentration (CMC), maximum surface excess (Γmax), minimal cross sectional surface area of surfactant polar group (A min), adsorption efficiency (pC20), surface pressure (π), and binding degree of counterion (β) were calculated. The values of standard Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were also computed. Via the dynamic light scattering method, diameters of aggregates of the synthesized cationic gemini surfactants were determined in water. It was established that the diameters of these aggregates decrease with a temperature rise. Antibacterial properties of the synthesized cationic surfactants against sulfate-reducing bacteria (SRB) were studied.

Imidazoline derivatives have been synthesized on the basis of synthetic petroleum acids and triethylentetramine. Complexes were prepared from the above-stated compounds and HCl in the ratio 1:2, 1:3. Note that 20% solutions of the complexes were prepared in aqueous isopropyl alcohol. The kinetic effect of steel corrosion in CO 2-saturated 1% NaCl solution has been examined by ACM Gill AC potentiometer. It revealed that imidazoline derivative complexes based on the SPA and TETA with HCl in the molar ratio 1:2 at concentration of 25 mg/l had corrosion protection 87.0%, at concentration of 50 mg/l-96.4% and at concentration 100 mg/l-97.1%; however, in the mole ratio of 1:3 the complex reveals its best results-93.8, 97.8 and 98.4%.

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