Influence of Hydroxyl Group Position and Temperature on Thermophysical Properties of Tetraalkylammonium Hydroxide Ionic Liquids with Alcohols

Abstract

In this work, we have explored the thermophysical properties of tetraalkylammonium hydroxide ionic liquids (ILs) such as tetrapropylammonium hydroxide (TPAH) and tetrabutylammonium hydroxide (TBAH) with isomers of butanol (1-butanol, 2-butanol and 2-methyl-2-propanol) within the temperature range 293.15–313.15 K, with interval of 5 K and over the varied concentration range of ILs. The molecular interactions between ILs and butanol isomers are essential for understanding the function of ILs in related measures and excess functions are sensitive probe for the molecular interactions. Therefore, we calculated the excess molar volume (VE) and the deviation in isentropic compressibility (Δκs) using the experimental values such as densities (ρ) and ultrasonic sound velocities (u) that are measured over the whole compositions range at five different temperatures (293.15, 298.15, 303.15, 308.15 and 313.15 K) and atmospheric pressure. These excess functions were adequately correlated by using the Redlich–Kister polynomial equation. It was observed that for all studied systems, the VE and Δκs values are negative for the whole composition range at 293.15 K. And, the excess function follows the sequence: 2-butanol>1-butanol>2-methyl-2-propanol, which reveals that (primary or secondary or tertiary) position of hydroxyl group influence the magnitude of interactions with ILs. The negative values of excess functions are contributions from the ion-dipole interaction, hydrogen bonding and packing efficiency between the ILs and butanol isomers. Hence, the position of hydroxyl group plays an important role in the interactions with ILs. The hydrogen bonding features between ILs and alcohols were analysed using molecular modelling program by using HyperChem 7.

Interaksi Molekuler Amonium Hidroksida

“…Rumus senyawa dari amonia adalah NH 3 (aq). Nama dari amonium hidroksida memperlihatkan suatu alkali dengan komposisi [NH4 + ][OH − ], faktanya NH4OH sangat sulit untuk dipisahkan, karena ion dari NH4OH tidak FINISH terdiri dari bagian yang substansial dari seluruh amonia kecuali di dalam larutan yang sangat encer (109)(110)(111)(112)(113)(114)(115)(116) .…”

Printable multi-walled carbon nanotubes thin film for high performance all solid state flexible supercapacitors

“…The electrolyte have already been demonstrated in our earlier report [21,22]. The gel electrolyte was prepared by dissolving host polymer PVdF-HFP and IL [23,24] [EMIM][BF4] separately in acetone. Afterward, solutions were mixed and stirred magnetically for 12 h. The weight ratio of the ionic liquid to polymer was kept at 4:1.…”

Effect of Ionic Liquids on the Physical Properties of the Newly Synthesized Conducting Polymer

“…Ionic liquids (ILs) are promising materials in the field of chemistry [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. They can be synthesized with various combinations of anion and cation [26][27][28][29] and have a wide range of the potential window, good electrochemical stability, and high ionic conductivity [14,17].…”