25114-67-4Relevant academic research and scientific papers
Effect of hydrogen bond of hydroxyl-functionalized ammonium ionic liquids on cycloaddition of CO2
Cheng, Weiguo,Xiao, Benneng,Sun, Jian,Dong, Kun,Zhang, Peng,Zhang, Suojiang,Ng, Flora T.T.
, p. 1416 - 1419 (2015)
A synergistic effect of the hydrogen bond on the cycloaddition of CO2 and epoxides to form cyclic carbonates was investigated through experimental study and characterization. A highly effective homogeneous system of hydroxyl-functionalized quaternary ammonium ionic liquids with a different number of the hydroxyl group in the cation was developed for the fixation of CO2 to form cyclic carbonates. A mechanism via the hydrogen bond activation for the cycloaddition was proposed based on both experimental data and modeling. This research enhances the understanding of the promotion of reaction via hydrogen bonding and forms the basis for the rational design of catalytic systems for the fixation of CO2 into organic compounds.
The effect of Me4NBr, Et4NBr, Bu4NBr, and (EtOH)3EtNBr on the temperature of maximum density of water
Blanco, Luis H.,Torres, Alexandra
, p. 1657 - 1669 (2008)
The densities of aqueous solutions of Me4NBr, Et4NBr, Bu4NBr, and Et(OH)3EtNBr were measured in the concentration range 0.002 to 0.05 mol·kg-1. The temperature of the determinations ranged from 275.15 to 279.15 K in 0.5 K steps, and the uncertainty of the densities was around ±1×10-6 g·cm-3. Eleven concentrations were used for each of the salts. It was found that all the solutes follow Despretz' law. The absolute value of the Despretz's constants increases with increasing number of carbon atoms in the cation, except for Et(OH)3EtNBr which has the highest value. The ionic contributions to the Despretz's constants were calculated. The volumetric data obtained allows the calculation proposed by Kalgud and Pokale. The effective ionic radii were calculated using a semi-empirical equation, as proposed previously by several workers. The nonlinearity of the plot of the ionic Despretz constants versus effective ionic radius is confirmed.
