|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
IJC-A Vol.49A(05-06) [May-June 2010] >
| Title: | Temperature dependent densities of mixtures of 1-butyl-3-methylimidazolium hexafluorophosphate + poly(ethylene glycol) |
| Authors: | Trivedi, Shruti
Pandey, Siddharth |
| Keywords: | Ionic liquids
Density
Excess properties |
| Issue Date: | Jun-2010 |
| Publisher: | CSIR |
| Abstract: | Densities of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6])
+ poly(ethylene glycol) (average molar mass 200 g mol–1) [PEG200]
mixtures have been measured over the entire composition regime in the
temperature range of 283.15–363.15 K at 10 degree intervals, using a density
meter based on electromagnetically induced oscillations of a
U-shaped glass tube and an inbuilt Peltier thermostat. The density versus
temperature data of [bmim][PF6] + PEG200 mixtures at each
composition have been fitted to a simple linear equation :  . The fits are observed to be satisfactory at each
composition. The excess molar volumes of [bmim][PF6] + PEG200 mixtures are
observed to be negative and significant over the entire composition range.
Irrespective of the temperature, the maximum absolute excess molar volumes are
observed in PEG-rich region at X[bmim][PF6] ~ 0.3.
Importantly, the absolute values of excess molar volumes for [bmim][PF6]
+ PEG200 mixtures appear to increase slightly with increasing temperature. These observations are attributed to the
presence of strong interactions within the [bmim][PF6] + PEG200
mixtures. Specifically, they are
proposed to be due to the presence of extensive intermolecular H-bonding involving
C2
hydrogen of [bmim+]
and
termini –OH as well as ethoxy –O– of PEG200 within [bmim][PF6] +
PEG200 mixtures. |
| Page(s): | 731-735 |
| Source: | IJC-A Vol.49A(05-06) [May-June 2010]
|
|
