Crystal structure and thermal decomposition kinetics of 1-(pyridinium-1-yl)propane-(1-methylpiperidinium) bi[bis(trifluoromethanesulfonyl)imide], [PyC sub(3)Pi][NTf sub(2)] sub(2)

The structure of a room temperature asymmetrical dicationic ionic liquid (ADIL), 1-(pyridinium-1-yl) propane-(1-methylpiperidinium) bi[bis(trifluoromethanesulfonyl)imide] ([PyC sub(3)Pi][NTf sub(2)] sub(2)), was studied by the X-ray diffraction method. Meanwhile, thermal analysis of [PyC sub(3)Pi][NTf sub(2)] sub(2) was also studied using non-isothermal thermogravimetric analysis (TGA). The title crystal belongs to the triclinic with space group P1 and unit-cell parameters a = 0.95217 (8) nm, b = 1.05129 (11) nm, c = 1.70523 (14) nm, alpha = 89.759 (8)[degrees], beta = 80.657 (7)[degrees], gamma = 68.007 (9)[degrees], and F(000) = 792. Thermal stability and thermal decomposition kinetics of the title compound were also investigated using TGA under the atmosphere of highly pure nitrogen. Heating curves at different rates were correlated with kinetic equations Friedman and ASTM (also called iso-conversion method). The values of average activation E (kJ times mol super(-1)) and pre-exponential constant lgA are 149.58 kJ times mol super(-1) and 8.83, respectively, which were obtained by the two methods. The kinetic model function, activation energy and pre-exponential constant of this reaction using the multivariate non-linear-regression method were [functionof]( alpha ) = (1 - alpha )(1 + 4.1870 alpha ), 151.04 kJ times mol super(-1) and 8.81, respectively, which were basically consistent with iso-conversion methods.