摘要 研究了二元闭环系统 { xn -C 3 H 7 ( n -C 4 H 9 ) 3 N + I − +(1− x )H 2 O} 的(液+液)相平衡。到 200 兆帕。根据合成方法在具有磁力搅拌的光学高压池中进行测量。报告了 p ( T ) 等值线的数据。生成等压 T ( x ) 相图,其表现出闭环行为。闭环的压力依赖性表明存在重叠的低压和高压不混溶状态,导致 ( p , T , x ) 不混溶表面的管状形状。结合四烷基铵盐系列的低级同系物的可用实验数据讨论了热力学函数的后果,这些同系物与水完全混溶。
Describes a method for obtaining substantially pure chloromethyl chloroformate from a chloroformate mixture comprising chloromethyl chloroformate and methyl chloroformate by heating the chloroformate mixture in a reaction zone at temperatures ranging from at least 50° C. to the reflux temperature of the chloroformate mixture in the reaction zone while simultaneously removing volatile gaseous decomposition products from the reaction zone. Dichloromethyl chloroformate may also be present in the chloroformate mixture.
The Competitive Formation of Different Olefins from Quaternary Amines
作者:Peter A. S. Smith、Simon Frank
DOI:10.1021/ja01122a067
日期:1952.1
Quaternary ammonium ions can externally block voltage-gated K+ channels. Establishing a theoretical and experimental model that predicts KDs and the selectivity of K+ over Na+ ions
作者:M.F Wempe
DOI:10.1016/s0022-2860(00)00774-2
日期:2001.5
The physicochemical basis for the high ion selectivity of potassium channels is poorly understood. In the present studies, external blockade of cloned voltage-gated potassium channels with alkyl quaternary ammonium ions are analyzed from a model derived from theory and experimental data. Atomic mass units, electrostatic potential residing on the nitrogen atom, the COSMO van der Waals solvent accessible surface, the Onsager solvation model, and the isodensity PCM solvation model are computed at the semi-empirical and the ab initio levels of theory. A structure-activity relationship (SAR) exists between the calculated values and the experimentally obtained K-D (mM). The SAR model gives us K-D predictions and when K+ and Na+ are incorporated into the model, it dramatically predicts the selectivity of K+ over Na+ ions. (C) 2001 Elsevier Science B.V. All rights reserved.
Van Calcar, Pamela M.; Olmstead, Marilyn M.; Balch, Alan L., Inorganic Chemistry, 1997, vol. 36, # 23, p. 5231 - 5238
作者:Van Calcar, Pamela M.、Olmstead, Marilyn M.、Balch, Alan L.
DOI:——
日期:——
Construction of a knitted crystalline polymer through the use of gold(<scp>I</scp>)–gold(<scp>I</scp>) interactions
作者:Pamela M. Van Calcar、Marilyn M. Olmstead、Alan L. Balch
DOI:10.1039/c39950001773
日期:——
Crystals of (Aul)(2)mu-bis(diphenylphosphino)hexane} form polymeric chains (through Au-Au contacts), which are interwoven to produce discrete layers that lie between cleavage planes of the crystal.