Plasticity and Ferroelasticity Transitions of Molecular Complex [(C₄H₉N₂)₂][Fe₃O(O₂CH)₉] on Heating and Cooling near Room Temperature

Abstract

(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.

A High Working Temperature Multiferroic Induced by Inverse Temperature Symmetry Breaking

“…In detail, similar to previous reports, the FPM counterions are generated in situ by the reaction of 3,3′-diaminodipropylamine and formic acid (Scheme S1). , After forming the ammonium salts, the excess formic acid further reacts with the other amine groups of 3,3′-diaminodipropylamine to form the amide group, which can be viewed as potential H-bond binding sites at the other sides of FPM. The high flexibility and great conformational transformability of FPM will endow 1 with a special phase transition behavior, which distinguishes it from the normal phase transition materials.…”

Designing dynamic coordination bonds in polar hybrid crystals for a high-temperature ferroelastic transition

“…6–15 Currently, the majority of documented ferroelastic phase transitions in hybrid crystals can be classified as mechanisms involving order–disorder and/or displacive type mechanisms. 16–27 For instance, (homopiperazine-1,4-diium)[K(BF 4 ) 3 ] exhibits a ferroelastic phase transition above room temperature, which is attributed to synergic order–disorder transitions of organic cations and BF 4 − bridges. 19 Besides, an unconventional type of structural phase transition, termed the bond-switching phase transition, has gained significant attention.…”

A three-dimensional Mn(ii) coordination polymer with ferroelasticity obtained by introducing coligands to form novel networks

“…In the last few years, considerable research has already been carried out on the construction and synthesis of coordination metal complexes possessing multidimensional network structures. 20 A fascinating challenge is the preparation of crystalline materials with certain required structural and topological features, as it implies that the relevant physical and chemical properties are controlled. 21 The networks formed by of small pseudo halides (N 3 − , NCS − and NCO − ) and the longer dicyandiamide, dca (dca = N(CN) 2 − ), with divalent metal( ii ) are considered to be the most studied pseudo halide compound networks.…”