Organic Ionic Plastic Crystals as Solid-State Electrolytes

Crystal structure, magneto-structural correlation, thermal and electrical studies of an imidazolium halometallate molten salt: (trimim)[FeCl4]

“…The local orientational or rotational disorder of the imidazolium cation in the halometallate molten salt could give rise to a noticeable conductivity as observed in other hybrid organicinorganic materials that possess aromatic species. 45 To address this issue, the temperature dependence of the conductivity was assessed by means of electrochemical impedance spectra (Nyquist plots) measured from room temperature (RT) to 400 K in the frequency range 10 À2 to 10 6 Hz (selected plots at 330 and 400 K are shown in Fig. 6).…”

Phase Transitions and Crystal Structures of Ionic Plastic Crystals Comprising Quaternary Ammonium Cations and Carborane Anion

“…3b The melting entropy of the Bu4N salt was higher than 20 J K −1 mol −1 , but such a relatively large entropy can be observed in organic ionic plastic crystals. 2 In the DEME salt, the sum of SII-I (7.4 J K −1 mol −1 ) and Sm (6.3 J K −1 mol −1 ) is lower than 20 J K −1 mol −1 , which indicates that phase II is also an orientationally disordered phase. Considering its anisotropic crystal lattice observed by powder X-ray diffraction measurements, phase II is probably a rotator phase.…”

“…Organic ionic plastic crystals are useful as solid-state electrolytes owing to their high ionic conductivity. 1,2 Onium cations have been extensively used in the design and synthesis of organic ionic plastic crystals over the last decade. 3,4 The plastic phase is often exhibited by solids containing globular molecules that exhibit orientational or rotational disorder, and as a consequence of the disorder, plastic crystals often display a small entropy of fusion (S < 20 J K −1 mol −1 ) and exhibit highly symmetric crystal structures with a cubic or hexagonal lattice.…”

“…5 Organic ionic plastic crystals often exhibit successive phase transitions from an ordered crystalline phase to orientationally disordered phases. [2][3][4] We report, herein, the phase transitions and crystal structures of several quaternary ammonium salts with the CB11H12 anion (cations: Me4N + , Et4N + , (C4H8)2N + , Bu4N + , and MeEt3(MeOCH2CH2)N + (DEME); Figure 1). The CB11H12 anion is a stable, weakly coordinating carborane anion with an icosahedral geometry.…”

Synthesis of an Adduct-Type Organic Ionic Crystal with Solid-State Ionic Conductivity from A Thiocyanate-Based Ionic Liquid and B(C6F5)3

“…Ionic liquid crystals (ILCs) [1][2][3] and organic ionic plastic crystals (OIPCs) [4][5][6] have attracted considerable attention as matrix materials for the development of innovative solid electrolytes. Both liquid crystals and plastic crystals are intermediate phases that lie between crystals and liquids; hence, ILCs and OIPCs undergo phase transitions to organic ionic crystals (OICs), as low-temperature phases, upon cooling in a similar manner to ionic liquids (ILs).…”