Supramolecular Catalytic Systems Based on a Cationic Amphiphile and Sodium Polystyrene Sulfonate for Decomposition of Organophosphorus Pollutants
摘要:
A supramolecular catalytic system for hydrolytic decomposition of toxic phosphorus acid esters has been obtained on the basis of a cationic surfactant with a morpholinium head group and sodium polystyrene sulfonate. Self-organization of the new binary catalytic system has been studied by tensiometry, conductometry, pH-metry, spectrophotometry, and dynamic and electrophoretic light scattering, and its aggregation thresholds have been determined. High solubilizing ability of the system with respect to a hydrophobic guest has been revealed. The morpholinium surfactant has been found to accelerate the hydrolysis of phosphonates up to 50 times in comparison to the reaction in water. The apparent hydrolysis rate constant in the presence of the polyelectrolyte decreases threefold due to reduction of the reactant binding constants.
Dialkylamino and nitrogen heterocyclic analogues of hexadecylphosphocholine and cetyltrimetylammonium bromide: Effect of phosphate group and environment of the ammonium cation on their biological activity
dialkylamino and nitrogen heterocyclic analogues of hexadecylphosphocholine and cetyltrimethylammonium bromide have been synthesized. The prepared compounds exhibit significant cytotoxic, antifungal and antiprotozoal activities. Alkylphosphocholines possess higher antifungal activity against Candida albicans in comparison with quaternary ammonium compounds. However, quaternary ammonium compounds exhibit
The surface adsorption and micelle formation of N-alkyl-N-methylmorpholinium bromide ([Mor1,n]Br n = 12, 14, 16) in aqueoussolution is investigated in this work. Through surface tension measurements, the effectiveness of surface tension reduction (∏cmc), the maximum surface excess concentration (Γmax) and the minimum area (Amin) occupied per surfactant molecule at the air/water interface at 25 °C
本文研究了N-烷基-N-甲基吗啉溴化物([Mor 1,n ] Br n = 12、14、16)在水溶液中的表面吸附和胶束形成。通过表面张力的测量,表面张力降低的(Π有效性CMC),最大表面过量浓度(Γ最大)和最小面积(A分钟)每个表面活性剂分子所占据在空气/水界面,在25℃下可以推导出。此外,临界胶束浓度(CMC)和各种热力学参数(标准Gibbs能(ΔG米0),焓(Δħ米0),和熵(Δ小号米0))是在不同温度下通过电导率测量得出的。热力学参数的结果表明,胶束化过程是由熵驱动的。
Polyfunctional supramolecular systems based on surfactants containing the hydroxyalkyl moiety in the head group
作者:E. I. Yackevich、A. B. Mirgorodskaya、S. S. Lukashenko、L. Ya. Zakharova
DOI:10.1007/s11172-014-0669-5
日期:2014.8
hydroxyethyl moiety in the head group were determined using a complex of physicochemical methods. The aggregation behavior of these compounds was found to vary insignificantly, whereas the catalytic effect of the hydroxyethyl derivative on the hydrolysis of carboxylic acid esters more than an order of magnitude exceeds the effect of the non-functionalized surfactant. One of the reasons for this phenomenon
increases and the aggregation number decreases upon the transition from a monocationic to a gemini analog. Morpholinium surfactants demonstrate a much higher solubilizing capacity toward the hydrophobic probe Orange OT as compared to the typical trimethylammonium surfactant. Both morpholinium surfactants form lipoplexes with a DNA decamer, which is strongly supported by the ethidium bromide exclusion