Electronic pyroelectricity: the interplay of valence tautomerism and spin transition

Abstract

The rational design of multifunctional molecular components serves as the basis for designing materials with practical applications. “Electronic pyroelectricity," i.e., transient voltage or current generated by the temperature-dependent spontaneous polarization...

Control of electronic polarization via charge ordering and electron transfer: electronic ferroelectrics and electronic pyroelectrics

“…Considering the increasing research attention that is recently being paid to the development of electronic ferroelectrics and electronic pyroelectrics, 24,25 we summarize in this article representative examples of molecular electronic ferroelectrics (Fig. 1…”

Competitive electronic and steric effects in the spin-state modulation of a 3D-Hofmann framework and its extension towards the nanoscale

“…, molecules that can reversibly interconvert between two stable states, imitate a binary state of 0 and 1, delivering a possibility for data storage and processing in smart materials. 1–3 For the systems associating the interconversion with a hysteretic behaviour of their physical properties, an intrinsic memory effect is observed in which the molecule can retain information about its immediate past, depending on the present state. 4,5…”

“…The emergence of switchable molecular materials, i.e., molecules that can reversibly interconvert between two stable states, imitate a binary state of 0 and 1, delivering a possibility for data storage and processing in smart materials. [1][2][3] For the systems associating the interconversion with a hysteretic behaviour of their physical properties, an intrinsic memory effect is observed in which the molecule can retain information about its immediate past, depending on the present state. 4,5 Among the plethora of switchable molecular materials, Fe IIbased porous spin crossover (SCO) coordination polymers constitute an emerging class, as (i) the largest possible magnetic response is observed from completely diamagnetic (t 2g 6 e g 0 , LS) to paramagnetic (t 2g 4 e g 2 , HS) state 6 and (ii) the microporous nature of the host allows the guests to efficiently perturb the physicochemical properties of the framework through the solid-state interactions present between the host and guest.…”

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

“…Bistable materials possessing two different states of physical channels, such as optical, electrical, magnetic, and mechanical properties, have attracted extensive concentration due to their great potential to realize seamless integration of multifunctional properties in one single device. − Among them, dielectric and nonlinear optical properties with bistable characteristics often exist in many functional materials, such as ferroelectrics, ferroelastics, ferromagnets, etc. − The bistability in many physical channels greatly improves the flexibility to control and retrieve the alternativity of the signal status. Some organic radicals with bistabilities in multiphysical channels, such as magnetism, conductivity, color, and IR transmittance due to the structural phase transition, were reported. ,− Nitroxyl radicals were usually designed as bistable magnetic materials arising from a radical/dimer interconversion (Figure a). − However, nitroxyl radicals with other bistable optoelectronic physical properties besides magnetism are rarely found as bistable multifunctional materials. Owing to the relatively high stability of nitroxyl radicals, ,, it is well worth excavating their bistability in other physical channels besides magnetic channels.…”