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Complexation mechanism of cucurbit[6]uril with hexamethylene diammonium cations in saline solution

28-10-2014 | Peng Liu; Xueguang Shao; Christophe Chipot; Wensheng Cai, Physical Chemistry Chemical Physics, 2014

Binding of cucurbit[6]uril (CB[6]) with the hexamethylene diammonium cation (HD2+) in the presence of sodium ions is elucidated at the atomic level. The most probable complex of CB[6] in saline solution is found to be CB[6]:Na+. A two-stage binding process of CB[6]:Na+ with HD2+ is proposed.


Molecular Recognition and Scavenging of Arsenate from Aqueous Solution Using Dimetallic Receptors

22-10-2014 | Chris D. Moffat, Dominik J. Weiss, Arun Shivalingam, Andrew J. P. White, Pascal Salaün, Ramon Vilar, Chemistry - A European Journal, 2014

Abstract A series of copper(II), nickel(II) and zinc(II) dimetallic complexes were prepared and their affinities towards arsenate investigated. Indicator displacement assays (IDAs) were carried out to establish the complexes with best affinities towards arsenate. A di‐zinc complex (3) was ...


pH-Responsive Anionic Wormlike Micelle Based on Sodium Oleate Induced by NaCl

22-10-2014 | Hongsheng Lu; Qianping Shi; Zhiyu Huang, Journal of Physical Chemistry B, 2014

A pH-responsive anionic surfactant wormlike micellar system induced by NaCl has been developed. In this work, the anionic surfactant, sodium oleate (NaOA) solutions, transforms from low-viscosity fluid into high-viscoelastic solution induced by NaCl of 200 mM to 350 mM concentration. According to ...


Interactions between a Series of Pyrene End-Labeled Poly(ethylene oxide)s and Sodium Dodecyl Sulfate in Aqueous Solution Probed by Fluorescence

21-10-2014 | Shaohua Chen; Jean Duhamel; Baoliang Peng; Masuduz Zaman; Kam C. Tam, Langmuir, 2014

The interactions between a series of poly(ethylene oxide)s covalently labeled at both ends with pyrene pendants (PEO(X)-Py2, where X represents the number-average molecular weight of the PEO chains and equals 2K, 5K, 10K, and 16.5K) and an ionic surfactant, namely, sodium dodecyl sulfate (SDS), ...


Almost Fooled Again: New Insights into Cesium Dodecyl Sulfate Micelle Structures

20-10-2014 | Han Seung Lee; Manickam Adhimoolam Arunagirinathan; Apostolos Vagias; Sangwoo Lee; Jayesh R. Bellare; H. Ted Davis; ..., Langmuir, 2014

Replacing sodium with cesium as the counterion for dodecyl sulfate in aqueous solution results in stronger complexation and charge shielding, which should lead to larger micelles and ultimately to a cylindrical structure (cf. spheres for sodium dodecyl sulfate), but small angle X-ray scattering ...


Mechanistic Studies of Silica Polymerization from Supersaturated Aqueous Solutions by Means of Time-Resolved Light Scattering

16-10-2014 | M. Kley; A. Kempter; V. Boyko; K. Huber, Langmuir, 2014

Silica polymerization in a supersaturated aqueous solution of sodium silicate is a fundamental mineralization process with broad relevance for technical applications as well as for biological processes. To contribute to a better understanding of the mechanism underlying the polymerization of ...


Instrument-Free Control of the Standard Potential of Potentiometric Solid-Contact Ion-Selective Electrodes by Short-Circuiting with a Conventional Reference Electrode

15-10-2014 | Ulriika Vanamo; Johan Bobacka, Analytical Chemistry, 2014

A simple, instrument-free method to control the standard potential (E°) of potentiometric solid-contact ion-selective electrodes (SC-ISE) is described. In this method, the electrode potential of a SC-ISE is reset by short-circuiting the electrode with a metallic wire to a conventional Ag/AgCl/3 M ...


A new three‐dimensional anionic cadmium(II) dicyanamide network

14-10-2014 | Qiang Li, Hui‐Ting Wang, Acta Crystallographica Section C, 2014

A new cadmium dicyanamide complex, poly[tetramethylphosphonium [μ‐chlorido‐di‐μ‐dicyanamido‐κ4N1:N5‐cadmium(II)]], [(CH3)4P][Cd(NCNCN)2Cl], was synthesized by the reaction of tetramethylphosphonium chloride, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal ...


Metastability of Large Aggregates and Viscosity, and Stability of The Pearl Necklace Conformation After Organic Solvent Treatment Of Aqueous Hydrophobic Polyelectrolyte Solutions

14-10-2014 | Wafa Essafi; Wifek Raissi; Amira Abdelli; François Boué, Journal of Physical Chemistry B, 2014

Aggregates—a phenomenon still not understood—as well as the pearl-necklace-like chain conformation in aqueous solutions of hydrophobic polyelectrolytes are addressed here, using treatment by an organic solvent. The second appear to be at equilibrium in water. The first appear to be metastable, ...


Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

13-10-2014 | Author(s): G. Garaix , L. Venault , A. Costagliola , J. Maurin , M. Guigue , R. Omnee , G. Blain , J. Vanden ..., Radiation Physics and Chemistry, 2014

Publication date: January 2015 Source:Radiation Physics and Chemistry, Volume 106 Author(s): G. Garaix , L. Venault , A. Costagliola , J. Maurin , M. Guigue , R. Omnee , G. Blain , J. Vandenborre , M. Fattahi , N. Vigier , P. Moisy A study of aqueous nitric acid solution alpha ...


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