Biocidal and anti‐corrosive activities of benzoimidazol‐3‐ium cationic Schiff base surfactants

Abstract

Two series of cationic Schiff base surfactants, namely, 2‐(benzylideneamino)‐3‐(2‐oxo‐2‐alkoxyethyl)‐1,3‐benzoimidazol‐3‐ium bromide (IA–D) and 2‐[(4‐methoxybenzylidene) amino]‐3‐(2‐oxo‐2‐alkoxyethyl)‐1,3‐benzoimidazol‐3‐ium bromide (IIA–D) were prepared. The chemical structures of the prepared Schiff bases were recognized by elemental analysis, FTIR, H NMR, C13‐NMR and GC/MS spectra. The surface activities of the synthesized Schiff base cationic surfactants showed their tendency towards adsorption at the air/water interface. The adsorption tendency was estimated from the values of surface tension and the depression of surface tension at the critical micelle concentration. The studied surfactants were evaluated as antimicrobial agents against pathogenic and sulfur‐reducing bacteria using inhibition zone diameters and minimum inhibition concentration values. The synthesized cationic benzoimidazolium Schiff base cationic surfactants showed good antimicrobial activities against the tested microorganisms including Gram positive, Gram negative as well as fungi. The synthesized compounds were tested for the activity as corrosion inhibitors against carbon steel corrosion in 0.5 M HCl at 200 and 400 ppm. The promising inhibition efficiency of these compounds against the sulfur‐reducing bacteria facilitates them to be applicable in the petroleum field as new categories of Sulfur Reducing Bacteria biocides. The inhibition efficiencies of the tested compounds showed good inhibition and protection of the carbon steel. The corrosion inhibition tendency correlated to the surface activity and chemical structure of the compounds.

Synthesis, surface, biological activity and mixed micellar phase properties of some biodegradable gemini cationic surfactants containing oxycarbonyl groups in the lipophilic part

“…antimicrobial activity against pathogenic bacteria and fungi as reported by several researchers [13][14][15][16][17] compared to gemini cationic surfactants. The quick and complete biodegradation after use is one of the significant factors for the next generation surfactants, because water-soluble surfactants are generally difficult to recover or recycle.…”

Synthesis, characterization and antimicrobial activity of N,N-bis(hydroxymethyl)-N-[(2-mercaptoacetoxy)methyl]alkyl ammonium bromide surfactant and their Co(II), Zn(II) and Sn(II) complexes

“…The inhibition zone formed by these compounds against the particular test microorganisms determined the biocidal Surface activities of the synthesized surfactants activity of the synthetic compounds. The mean value for three replicates was used to calculate the zone of growth inhibition of each sample [45,46].…”

Vanillin-derived non-ionic surfactants as green corrosion inhibitors for carbon steel in acidic environments

“…These surfactants are characterized by their extreme tendency towards biodegradation, which means the degradation of organic compounds using microorganisms to produce compounds of low molecular weight, such as alcohols and short-chain fatty acids. The withdrawal of toxic and nonbiodegradable surfactants from commercial use and their replacement with green and biodegradable surfactants is highly necessary [18][19][20][21][22][23][24][25][26][27][28][29]. The aim of this study is to synthesize some non-ionic surfactants derived from vanillin (a natural compound) and to study their surface activity and biodegradability, and also to evaluate these compounds as corrosion inhibitors for carbon steel in 0.5-M hydrochloric acid (HCl).…”