By adjusting the substituent group of the organic ammonium in three molecular ionic complexes, [A][Fe3O(O2CH)8(H2O)]2 (A = NH3(CH2)3NH3 for 1, CH3NH2(CH2)3NH3 for 2 and CH3CH2NH2(CH2)3NH2CH2CH3 for 3) crystallized in 2/m...
(1), is constructed by an oxo-centered trinuclear iron anion and a semi-rigid ring-like cation 1,4,5,6-tetrahydropyrimidin-ium, which is generated in situ by reacting formic acid and 1,3-propylenediamine. The molecular motion change of anions and cations produces continuously reversible plasticity and ferroelasticity transition on heating and cooling near room temperature.
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