5436-93-1Relevant articles and documents
Potentiometric discrimination of organic amines by a liquid membrane electrode based on a lipophilic hexaester of calix[6]arene
Odashima, Kazunori,Yagi, Kenichi,Tohda, Koji,Umezawa, Yoshio
, p. 1074 - 1083 (1993)
A novel type of poly(vinyl chloride) matrix liquid membrane electrode that is capable of discriminating the steric shapes of nonpolar moieties of organic amines at neutral pH has been developed. A new lipophilic hexaester of calix[6]arene having a well-defined inclusion cavity for organic guests [37,38,39,-40,41,42-hexakis(decyloxycarbonylmethyloxy)calix[6]-arene] was synthesized and exploited as a sensory element. This electrode displayed the strongest potentiometric responses to the primary amines having no substituent adjacent to the amino group such as 1-octylamine, 2-phenylethylamine, and dopamine. An examination of potentiometric selectivities for different series of organic amines, as well as a 1H-NMR study on the geometry of the host-guest complexes, strongly supported a mode of potentiometric discrimination that depends on the availability of a stable inclusion complex involving the formation of tripodal hydrogen bonds between the NH3+ group of the guest and the C=O groups of the host. Such a mode of potentiometric discrimination based on the recognition of the steric shapes of nonpolar moieties was not attained by the electrodes based on dibenzo-18-crown-6 or potassium tetrakis-(p-chlorophenyl)borate having no inclusion cavity for organic guests; both of these electrodes showed a selectivity that reflects simple lipophilicity of the guests.
Preparation method of tetra-ester gemini quaternary ammonium salt leather sterilization mildew inhibitor
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Paragraph 0016; 0028, (2021/07/31)
The invention discloses a preparation method of a tetra-ester gemini quaternary ammonium salt leather sterilization mildew inhibitor. The preparation method comprises the following steps: firstly, taking hydroxyl-terminated diol and chloroacetyl chloride as reactants, and synthesizing ester dichloride through nucleophilic substitution reaction; then carrying out nucleophilic substitution reaction on the ester group dichloride and diethylamine to synthesize ester group di-tert-amine; then using fatty alcohol and bromoacetyl bromide as reactants to synthesize bromoacetate through acylation reaction; and finally, carrying out quaternization reaction on the obtained bromoacetate and ester group di-tert-amine to obtain the tetra-ester gemini quaternary ammonium salt bactericidal mildew inhibitor, and respectively distributing ester groups on a spacer group and a hydrophobic chain of the gemini quaternary ammonium salt. The tetra-ester gemini quaternary ammonium salt leather sterilization mildew inhibitor prepared by the method has good antibacterial and mildew-proof performance, can be applied to the sterilization and mildew-proof field of leather, and has a good market application prospect.
Biocidal activity and corrosion inhibition of some cationic surfactants derived from thiol polyurethane
Zaky, Mohamed F.,Sabbah,Negm,Hendawy
, p. 45 - 60 (2018/06/18)
S IX series of cationic polyurethane surfactants [PQ10-20] were synthesized by the reaction between different six esters (which prepared by condensation of fatty alcohols namely: octanol, decanol, dodecanol, tetradecanol, hexadecanol and octadecanol with bromoacetic acid) and polyurethane as quaternizing agent. The chemical structures of these surfactants were confirmed using elemental analysis, FTIR spectra,+HNMR and UV analysis. The surface activities of the synthesized cationic thiol polyurethane 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 thiol polyurethane 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 2N H2SO4 at 50, 100, 200, 400 and 600 ppm. 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.
