4499-86-9Relevant articles and documents
Novel ionic liquid with peroxyniobate-radical negative ions and preparing method thereof
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Page/Page column 6; 7, (2016/12/01)
The invention relates to novel ionic liquid with peroxyniobate-radical negative ions and a preparing method thereof. The ionic liquid comprises imidazolium salt positive ions, quaternary ammonium salt positive ions and the peroxyniobate-radical negative ions. The preparing method of the ionic liquid includes the steps that 1, alkyl-replacing N-methylimidazole hydrochloride is prepared from N-methylimidazole; 2, alkyllimidazolium salt chloride and quaternary ammonium salt halogenide are subjected to ion exchange to obtain corresponding ethanol solutions of hydroxide; 3, ammonium peroxyniobate is prepared from commercial niobium pentoxide with the document method; 4, the brand-new-structure ionic liquid with the peroxyniobate-radical negative ions is obtained with the ion exchange (acid-base neutralization) method. According to the novel ionic liquid with the peroxyniobate-radical negative ions and the preparing method thereof, the ionic liquid is prepared for the first time, the preparing method is simple, the yield is high, and the characteristics of a niobium element can be fully used to carry out a certain catalytic oxidation reaction.
Temperature effect on the molecular interactions between ammonium ionic liquids and N, N-dimethylformamide
Attri, Pankaj,Venkatesu, Pannuru,Kumar, Anil
experimental part, p. 13415 - 13425 (2011/02/18)
In view of the wide scope of molecular interactions between the highly polar compound of N,N-dimethylformamide (DMF) and ammonium ionic liquids (ILs), we have measured thermophysical properties such as densities (??) and ultrasonic sound velocities (u) over the whole composition range at temperatures ranging from 25 to 50 ?°C under atmospheric pressure. To gain some insight into the several aggregations of molecular interactions present in these mixed solvents, we predicted the excess molar volume (VE) and the deviations in isentropic compressibilities (??Ks) as a function of the concentration of IL. These results are fitted to the Redlich-Kister polynomials. The materials investigated in the present study included the hydroxide series of ammonium ILs of tetramethylammonium hydroxide [(CH 3)4N][OH] (TMAH), tetraethylammonium hydroxide [(C 2H5)4N][OH] (TEAH), and tetrapropylammonium hydroxide [(C2H7)4N][OH] (TPAH). The intermolecular interactions and structural effects were analyzed on the basis of the measured and the derived properties. A qualitative analysis of the results is discussed in terms of the ion-dipole and ion-pair interactions, and hydrogen bonding between ILs and DMF molecules and their structural factors. ? 2010 American Chemical Society.