Home
Resources
Publications
Structural Organization in Aqueous Solutions of 1-Butyl-3-methylimidazolium Halides: A High-Pressure Infrared Spectroscopic Study on Ionic Liquids

Structural Organization in Aqueous Solutions of 1-Butyl-3-methylimidazolium Halides: A High-Pressure Infrared Spectroscopic Study on Ionic Liquids

Hai-Chou Chang, Jyh-Chiang Jiang, Chao-Yen Chang, Jong-Chang Su, Chao-Hsin Hung, You-Chang Liou, Sheng Hsien Lin

J Phys Chem B. 2008 Apr 10;112(14):4351-6.

PMID: 18341320

Abstract:

High-pressure infrared spectroscopy was applied to study the hydrogen-bonding structures of 1-butyl-3-methylimidazolium halides/D2O mixtures. No drastic changes were observed in the concentration dependence of the alkyl C-H band frequency at high concentration of 1-butyl-3-methylimidazolium chloride. Nevertheless, the alkyl C-H exhibits an increase in frequency upon dilution at low concentration. These observations may indicate a clustering of the alkyl groups at high concentration and the formation of a certain water structure around alkyl C-H groups in the water-rich region. The imidazolium C-H band at ca. 3051 cm(-1) displays a monotonic blue-shift in frequency as the sample was diluted at high concentration of 1-butyl-3-methylimidazolium chloride. That is, water can be added to change the structural organization of 1-butyl-3-methylimidazolium chloride in the ionic liquid-rich composition region by introducing water-imidazolium C-H interactions. Analyzing the pressure dependence of the imidazolium C-H stretches yielded anomalous nonmonotonic pressure-induced frequency shifts. This result may reflect the strengthening of C-H-O interactions between imidazolium C-H groups and the water clusters. Density functional theory calculations also revealed that the characteristic bonded C2-H vibration may be shifted via the modification of C2-H-Cl- associations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP79917901	1-Butyl-3-methylimidazolium chloride		79917-90-1	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: