A novel series of surfactants was synthesized via direct interaction of the hydrogen-accepting benzyl monophenyl hydrazone and different hydrogen-donating sulfate, sulfonate, sulfosuccinate, or taurate species in their acid form. The double salt surfactants produced had a benzyl monophenyl hydrazonium (PH) moiety as the cation, and lauryl sulfate, dodecylbenzene sulfonate, dioctyl sulfosuccinate, N-cetyloxycarbonyl ethyltaurate (COCET), and N-stearyloxycarbonyl ethyltaurate as the anion. The structural elucidation of the synthesized compounds was carried out using different analytical tools such as elemental analyses, sharp melting points, and Fourier transform infrared and 1 H nuclear magnetic resonance spectroscopy. Surface properties of these synthesized hydrazonium derivatives, including surface tension and emulsion stability, were measured and correlated with their chemical structure. The corrosion inhibition efficiency of these hydrazonium derivatives at different concentrations (20, 40, 60, 80, and 100 ppm) was measured in brine containing 5% H 2 S as the corrosive medium. The inhibition efficiency results were discussed according to the inhibitor concentrations in the corrosive medium, chemical structures, surface properties, and hydrophile-lipophile balance of these inhibitors. The corrosion inhibition measurements of these compounds showed that PH-COCET exhibits good efficiency at all concentration ranges.Paper no. S1411 in JSD 8, 95-98 (January 2005).
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