Phenyl/alkyl-substituted-3,5-dimethylpyrazolium ionic liquids

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

“…Thermal stability of 1-alkyl-4-methyl-1,2,4triazolium [NTf2] ILs in Figure 13 reveals that there is no correlation between Tonset and alkyl chain length, and T0.01/10h instead increases with the increase of alkyl chain length [75]. The same results are obtained for some 3,5-dimethylpyrazolum ILs and some paramagnetic ILs [108,109]. In the study of amino acid ILs, [N1,1,14,2O12][Lys] with the longchain alkyl group on the side of nitrogen has higher thermal stability than [N1,1,6,2O12][Lys] under the isothermal condition, while both longer and shorter alkyl side chains harm the thermal stability under the non-isothermal condition [77].…”

Evaluation of Short Alkyl Chain Modified [Dbu][Tfsi] Based Ionic Liquids as Supercapacitor Electrolytes

“…Higher number of hydrogen atoms in the longer chains results in stronger interactions and thus lowered mobility of charged species [37]. Similarly, in literature examples of ILs incorporating the imidazolium [11] and pyrazolium cation [33] extending the cation alkyl chains resulted in increased viscosities. Furthermore, the ether bond in the alkyl chain in [DBU-C1-O-C2][TFSI] did not bring any significant improvement to the ILs conductivity and stability.…”

“…In this work, it was found that for the case of relatively narrow range of alkyl chains, from C2 to C6, the length does not visibly affect the stability of the cation as much, resulting in electrochemical window range of 4.7-4.8 V which is in the same range of common commercial and lately reported novel based ILs with TFSI-anion (Table S1, SI). It has to be noted that these values are also are higher than in other kinds of ILs, such as imidazolium, sulfonium and guanidinium based ones [33]. It can be stated that even though there are some differences in water impurities in ILs this does not affect the electrochemical stability, which is almost constant.…”

Tunable aryl alkyl pyrazolium tetrafluoroborate ionic liquids/salts: synthesis, characterization, and applications for removal of methyl orange from aqueous solution

“…The existing ILs consist predominantly of 1,3-dialkylsubstituted imidazolium cations and organic/inorganic anions (CH3COO -, CH3SO3 -, HSO4 -, Cl -, BF4 -, PF6 -). Although pyrazole is the structural isomer of the imidazole structure, the number of studies associated with pyrazolium based ILs is quite limited compared to imidazolium-based ILs [2][3][4][5][6][7]. The synthesis of ILs is generally carried out by following a two-step synthetic procedure.…”