Ascend 400 mhz instrument

PB1000 was purchased from GreenValue LLC (USA).27 [HMIM]Br was synthesized by following a previously reported procedure.28 EA was purchased from Carlo Erba Reagents (France) and used as received. All other reagents as well as compounds A (ref 410659) and B (ref 796883), were purchased from Sigma–Aldrich Chemical Co. (USA) and were used as received.
Thin‐layer chromatography (TLC) experiments were performed with aluminum strips coated with Silica Gel 60 F₂₅₄ from Macherey–Nagel, revealed under UV light (254 nm), then in the presence of a 5 % w/w ethanolic solution of phosphomolybdic acid. Evaporations were conducted under reduced pressure at temperatures below 35 °C unless otherwise stated. Column chromatography (CC) was performed with an automated flash chromatography PuriFlash system and pre‐packed INTERCHIM PF‐30SI‐HP (30 μm silica gel) columns. ¹H and ¹³C NMR spectra were recorded in CD₃OD at 400 or 100 MHz, respectively, with a Bruker Ascend 400 MHz instrument. Chemical shifts are reported in ppm relative to internal references (solvent signal).

Fourier transform infrared spectroscopy (FTIR) was conducted using a PerkinElmer (Waltham, MA, USA) frontier infrared spectrometer in the spectral range of 4000–500 cm⁻¹. Proton nuclear magnetic resonances (¹H-NMR) and fluoride nuclear magnetic resonances (¹⁹F-NMR) were obtained using a Bruker (Billerica, MA, USA) (Ascend) 400 MHz instrument in DMSO-d₆ containing tetramethylsilane (TMS) as the internal standard. Scanning electron microscopy (SEM) (JEOL, Tokyo, Japan) was performed with an ULTRA 55 field emission scanning electron microscope (FESEM) in the secondary electron mode with an accelerating voltage of 3 kV. The dielectric and alternating current (AC) conductive properties of the nanocomposites were measured on an HP4284A LCR meter (Hewlett-Packard, Palo Alto, CA, USA) in the frequency range of 100 Hz~1 MHz with 1 V at room temperature. Electric displacement–electric field (D-E) loops were obtained at 10 Hz using a Precision Premier II ferroelectric polarization tester (Radiant, Inc., Renton, WA, USA). Twelve specimens were used for the breakdown strength test for each sample. The energy storage performances were calculated according to the D-E results.