Publications by authors named "Mai Ishida"

In recent years, ionic plastic crystals have attracted much attention. Many metallocenium salts exhibit plastic phases, but factors affecting their phase transitions are yet to be elucidated. To investigate these factors, we synthesized octamethylferrocenium salts with various counteranions [Fe(CMeH)]X ([1]X; X = B(CN), C(CN), N(CN), FSA (= (SOF)N), FeCl, GaCl and CPFSA (= CF(SOCF)N)) and elucidated their crystal structures and phase behavior.

View Article and Find Full Text PDF

Sandwich compounds often exhibit various phase transitions, including those to plastic phases. To elucidate the general features of the phase transitions in metallocenium salts, the thermal properties and crystal structures of [Fe(C Me ) ]X ([1]X), [Co(C Me ) ]X ([2]X), and [Fe(C Me H) ]X ([3]X) have been investigated, where the counter anions (X) are Tf N (=(CF SO ) N ), OTf (=CF SO ), PF , and BF . The Tf N salts commonly undergo phase transitions from an ordered phase at low temperatures to an anion-disordered phase, followed by a plastic phase and finally melt at high temperatures.

View Article and Find Full Text PDF