Transition Metal‐Containing Ionic Liquid Crystals with 1‐Decyl‐2,3‐dimethylimidazolium: Facile Syntheses, Crystal Structures, Thermal Properties and NH₃ Detection

Abstract

Herein we report on the facile and large‐scale syntheses and characterizations of a series of transition metal‐containing ionic liquids (MILs), namely [C12MMIm]n[MCl4] (M=Fe3+, n=1; M=Cu2+, Co2+, Zn2+, Cd2+, n=2; C12MMIm=1‐decyl‐2,3‐dimethylimidazolium) by simply stoichiometrically mixing metal chlorides and the IL [C12MMIm]Cl. All of the compounds could be obtained in crystalline state at room temperature in nearly 100% yield. Single‐crystal X‐ray diffraction analysis reveals that all the MIL crystals belong to the space group of P21/c, consisting of [C12MMIm]+ cations and halometallate anions that interact with each other giving rise to supramolecular layered structures via C−H⋅⋅⋅Cl hydrogen bonding and anion‐π interactions. Thermal properties of the five compounds were studied by differential scanning calorimetry (DSC) and thermogravimetry (TG), revealing reversible phase transitions near room temperature. Interestingly, these MILs are air‐ and moisture‐stable when stored in ambient conditions. The [C12MMIm]n[MCl4] (M=Cu2+, Co2+ and Fe3+ ) crystals exhibited obvious colour‐change when exposed to ammonia (NH3) gas, indicating potential applications in ammonia detection.

Small‐Sized CuS Nanoparticles/N, S Co‐Doped rGO Composites as the Anode Materials for High‐Performance Lithium‐Ion Batteries

“…Synthesis of Metal‐Containing Ionic Liquid Precursors [C n MMim] 2 [CuCl 4 ] (n = 6, 8, 10) : MILs [C n MMim] 2 [CuCl 4 ] ( n = 6, 8, 10) were prepared according to previous reported works . Taking [C 6 MMim] 2 [CuCl 4 ] for example, [C 6 MMim]Cl (10 mmol, 2.17 g), CuCl 2 ·2H 2 O (5.0 mmol, 0.852 g), and RO water (10 mL) was added in a 50 mL round‐bottomed flask, followed by magnetically stirring for 30 min.…”

Bridging the crystal and solution structure of a series of lipid-inspired ionic liquids

“…35,36 Further, while most of the reported structures are of the [C n mim] cations when n Z 10, few reports currently exist using the dmim heterocycle as a cation with halide counter ions despite the favorable properties the dmim cation can impart. 37 Recently, the Mudring group has reported the synthesis and characterization of several asymmetrical dmim-based ILs with long alkyl chains. 38 These dmim-based ILs displayed higher melting and clearing points while displaying increased hydrophobicity when contrasted with ILs based on methylimidazolium headgroups.…”