Synthesis, characterization, and phase transition of an inorganic-organic hybrid compound, (3-nitroanilinium +)(18-crown-6)IO4-(CH3OH)

摘要

A novel inorganic-organic hybrid supramolecular compound,[(3-nitroanilinium+)(18-crown6)][IO4-](CH3OH) (1),was discovered as phase-transition materials displaying dielectric anomalous behaviors.The yellow block crystal formed by N-H...O hydrogen bonding that made contact through the cavity of 18-crown-6 was characterized by single-crystal X-ray diffraction,elemental analysis,infrared analysis,thermogravimetric analysis,differential scanning calorimetry,and potential-energy calculations.Differential scanning calorimetry measurements indicate that the compound experiences a reversible phase transition at around 220 K.Temperature-dependent dielectric measurements further confirm the phase transitions.Potential-energy calculations demonstrate that the phase transition occurs due to the molecular order-disorder rotation of CH3OH,whereas the space grouping of the crystal remains unchanged.