Nuclear Magnetic Resonance Spectroscopy

Advances in nuclear magnetic resonance spectroscopy: case of proton conductive materials

“…The conductivity of Bi-ePA is (1.37 ± 0.01)$10 −9 S cm −1 at room temperature, while the conductivity values of the composite samples with 42% and 22% of IL loadings are (1.19 ± 0.01)$10 −5 S cm −1 and (9.4 ± 0.3)$10 −7 S cm −1 , respectively. The value of activation energy found by 31 P CODEX NMR performed at various temperatures is lower as compared with the activation energy value determined from the EIS measurements. This fact underlines the important role of grain boundaries in longrange ion transport.…”

“…26,27 Such a technique has a long history of development starting from the observation of proton wide-line spectra in solution and up to multidimensional experiments in solid-state (e.g. to provide information about molecular reorientations of NMR active nuclei such as 13 C, 15 N, or 31 P, etc.). Today NMR spectroscopy is a complex analysis which includes a number of individual techniques.…”

“…Today NMR spectroscopy is a complex analysis which includes a number of individual techniques. 26 Since the basis and principles of all NMR techniques are already described in detail in a number of publications, 19,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] only a brief description of the ssNMR technique will be presented here. The ssNMR technique is used to obtain information about the molecular mobility and, consequently, ion conductivity, water and methanol transport properties in different materials, such as protic ionic liquids (ILs) and their nanocomposites, solid proton conductive salts, and polymer electrolytes.…”

“…The hydrogen-bonding structure of neat ILs and their composites with Teon membranes is established using solidstate 1 H-1 H DQC coupled with 31 P CODEX NMR analysis. 56 For this purpose, the following ILs were selected: benzimidazole phosphate (Bi-PA), benzimidazole methylphosphonate (Bi-mPA) and benzimidazole ethylphosphonate (Bi-ePA) (Fig.…”