Synthesis, characterization, and thermophysical properties of 1,8-diazobicyclo5.4.0undec-7-ene based thiocyanate ionic liquids

Lethesh, K.C. and Shah, S.N. and Mutalib, M.I.A. (2014) Synthesis, characterization, and thermophysical properties of 1,8-diazobicyclo5.4.0undec-7-ene based thiocyanate ionic liquids. Journal of Chemical and Engineering Data, 59 (6). pp. 1788-1795. ISSN 00219568

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Abstract

In this work, synthesis of 12 ionic liquids based on 1,8-diazobicyclo5.4. 0undec-7-ene (DBU) cation with anions such as chloride, bromide, and thiocyanate were performed. The new ionic liquids were characterized using nuclear magnetic resonance spectroscopy and elemental analysis. The effect of alkyl spacer length on the physicochemical properties of DBU based ionic liquids was studied by attaching ethyl, butyl, hexyl, octyl, decyl, and tetradecyl groups to the DBU cation. The effects of temperature on the density and viscosity over a temperature range from 293.15 K to 373.15 K were recorded at atmospheric pressure. From the experimental density values, the thermal expansion coefficient values were calculated. The surface tension of the neat ionic liquids was measured at seven different temperatures (293.15 K, 303.15 K, 313.15 K, 323.15 K, 333.15 K, 343.15 K, and 353.15 K). The surface entropy and surface enthalpy were calculated from the experimental surface tension value at 303.15 K. The thermal behavior of these ionic liquids was studied using thermogravimetric analysis and differential scanning calorimetry. © 2014 American Chemical Society.

Item Type: Article
Additional Information: cited By 50
Uncontrolled Keywords: Atmospheric pressure; Chlorine compounds; Differential scanning calorimetry; Nuclear magnetic resonance spectroscopy; Positive ions; Surface tension; Thermodynamic properties; Thermogravimetric analysis, Effects of temperature; Physicochemical property; Surface enthalpies; Surface entropies; Surface tension values; Temperature range; Thermal behaviors; Thermal expansion coefficients, Ionic liquids
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 09 Nov 2023 16:15
Last Modified: 09 Nov 2023 16:15
URI: https://khub.utp.edu.my/scholars/id/eprint/4293

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