The inclusion compound [(CH3)2NH2]2[KCo(CN)6] exhibits a marked temperature-dependent dielectric constant and can be considered as a model of tunable and switchable dielectric materials. Crystal structure and solid-state NMR studies reveal a switchable property between low and high dielectric states around 245 K. This originates from an order-disorder phase transition of the system, changing the dynamics of the polar dimethylammonium (DMA) cation. Furthermore, the tuning of the dielectric constant at temperatures below the phase transition point is related to increasing angular pretransitional fluctuations of the dipole moment of DMA.
In the title compound, C3H5N2
+·C2HO4
−, the anions form centrosymmetric dimers through cyclic O—H⋯O hydrogen-bonding associations [graph set R
2
2(10)]. These dimers are then linked through a cyclic R
4
2(10) N—H⋯O hydrogen-bonding association involving two cations and the carboxyl O-atom acceptors of separate anions, giving chain structures extending across the (111) plane.
One novel organic-inorganic hybrid compound, (p-CH 3 -OC 6 H 4 NH 3 ) + (18-crown-6)·H 2 PO 4 -·2H 3 PO 4 (1) ((p-CH 3 OC 6 H 4 NH 3 ) + = 4-methoxyphenylammonium; 18-crown-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane), has been synthesized and characterized by IR spectroscopy, thermogravimetric analysis and single crystal X-ray diffraction. In the structure, the organic (p-CH 3 OC 6 H 4 NH 3 ) + (18-crown-6) supermolecular cation layer and inorganic phosphate anion layer arrange
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