TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Mueller, Holger
A1  - Junginger, Matthias
A1  - Kelling, Alexandra
A1  - Schilde, Uwe
A1  - Strehmel, Veronika
A1  - Holdt, Hans-Jürgen
T1  - Imidazolium 2-substituted 4,5-dicyanoimidazolate ionic liquids: synthesis, crystal structures and structure-thermal property relationships
T2  - Chemistry - a European journal
N2  - Thirty six novel ionic liquids (ILs) with 1-butyl-3-methylimidazolium and 3-methyl-1-octylimidazolium cations paired with 2-substitited 4,5-dicyanoimidazolate anions (substituent at C2=chloro, bromo, methoxy, vinyl, amino, methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl and phenyl) have been synthesized and characterized by using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and single-crystal X-ray crystallography. The effects of cation and anion type and structure on the thermal properties of the resulting ionic liquids, including several room temperature ionic liquids (RTILs) are examined and discussed. ILs exhibited large liquid and crystallization ranges and formed glasses on cooling with glass transition temperatures in the range of -22 to -68 degrees C. The effects of alkyl substituents of the imidazolate anion reflected the crystallization, melting points and thermal decomposition of the ILs. The Coulombic packing force, van der Waals forces and size of the anions can be considered for altering the thermal transitions. Three crystal structures of the ILs were determined and the effects of changes to the cations and anions on the packing of the structure were investigated.
KW  - crystal structures
KW  - imidazole
KW  - ion exchange
KW  - ionic liquids
KW  - pi-pi stacking
Y1  - 2014
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/37768
SN  - 0947-6539
SN  - 1521-3765
VL  - 20
IS  - 26
SP  - 8170
EP  - 8181
PB  - Wiley-VCH
CY  - Weinheim
ER  -