@misc{EfimovaHubrigSchmidt, author = {Efimova, Anastasia and Hubrig, Grit and Schmidt, Peer}, title = {Thermal stability and crystallization behavior of imidazolium halide ionic liquids}, series = {Thermochimica Acta}, volume = {Vol. 573}, journal = {Thermochimica Acta}, issn = {0040-6031}, doi = {10.1016/j.tca.2013.09.023}, pages = {162 -- 169}, abstract = {The 1-butyl-3-methylimidazolium halide ionic liquids are stable up to temperatures of 246(1) °C ([BMIm]Cl), 260(1) °C ([BMIm]Br), and 238(1) °C ([BMIm]I). The thermal decomposition proceeds in thermogravimetric measurements with a total mass loss of 100\%. Using evolved gas analysis (EGA) a complete degradation of [BMIm]X ionic liquids under formation of characteristic fragments CH3+, NHn+, C4Hn+, and CH3X+ (X = Cl, Br, I) has been observed. [BMIm]Cl shows enantiotropic polymorphism with a phase transition temperature at 30(1) °C, and melts at 74(1) °C (ΔHfus = 18 ± 0.5 kJ mol-1). Spontaneous e-crystallization and reversible phase transition have been found for cooling of the substance.[BMIm]Br melts at 78(1) °C (ΔHfus = 29 ± 0.5 kJ mol-1). The re-crystallization fails and thus a glassy solid is formed. The glass transition temperature is about -65 °C, the cold crystallization occurs between -30 and -20 °C. The application of both homogeneous and heterogeneous nucleation agents does not interfere the glassy state. [BMIm]I undergo solidification without crystallization. The melting effect for the amorphous substance arise at -70(5) °C with ΔHfus = 0.4 ± 0.2 kJ mol-1.}, language = {en} }