Confinement Effects on the Ionic Liquid Dynamics in Ionosilica Ionogels: Impact of the Ionosilica Nature and the Host/Guest Ratio

Ionosilica ionogels have been lately introduced as emerging all-ionic designer materials. They consist of an ionic liquid (IL) guest trapped within a solid ionosilica support host. In this work, we investigate the influence (i) nature and (ii) ionosilica/IL ratio on mobility confined IL. We report elaboration various via nonhydrolytic sol–gel process, using namely tris(3-(trimethoxysilyl)propyl)amine (TTA), methyl-tris(3-(trimethoxysilyl)propyl)ammonium iodide (MTTA), tetrakis(3-(trimethoxysilyl)-propyl)ammonium (TKTA) precursors, with IL butyl-methyl imidazolium bis(trifluoromethanesulfonyl)imide ([BMIM] TFSI). Various were prepared from different ratios between host guest. The host/guest interactions, i.e., change in conformational contribution counter-anion, explored by means Raman spectroscopy. addition, transport properties species probed spin echo solid-state NMR experiments Complex Impedance Spectroscopy (CIS) measurements. revealed equilibrium for TFSI anion ionogels, increase cisoid form compared to bulk due confinement effects. seems experience degrees thus interactions scaffold function investigated parameters. Concomitantly, 1H CIS measurements significantly higher materials synthesized tris-trialkoxysilylated ammonium precursor one tetra-trialkoxysilylated precursor. These results may reflect stronger host–guest latter case related degree network reticulation. All these techniques give concordant highlight effect chemical constitution amount its dynamics network.