Spin-Crossover Coordination Nanoparticles

Abstract

Spin-crossover coordination nanoparticles of the cyanide-bridged three-dimensional network Fe(pyrazine){Pt(CN) 4} were prepared at three different sizes using a microemulsion. The 14 nm particles present a transition centered around 265 K with a hysteresis of 6 K.

Spin Switching in Electronic Devices Based on 2D Assemblies of Spin‐Crossover Nanoparticles

“…[14] SCO NPs of other materials forming 3D networks have also been studied in this context, but in most cases they undergo a fast decrease of the hysteresis width upon size reduction, which has been accompanied by a higher residual high spin fraction and a downshift of the transition temperatures. [19] Recently, the memory effect of the [Fe(Htrz) 2 (trz)](BF 4 ) NP(s) has electrically been demonstrated, [6,8,9] showing their potential as switching elements of nanoscale devices.Nevertheless, opposite behaviour in the conductivity change during the SCO transition has been reported, which remains unclear mainly due the scare experimental studies of the effects of an electric field on the charge transport properties. [20,21] In particular, measurements on single NP devices (NP mean size of 10 nm) show an increase in the electric conductivity when the SCO occurs, [6] whereas the reverse situation is observed for an assembly of NPs (mean size 15 nm) [8] and for larger particles [8][9][10] (from 100 to 300 nm in diameter and from 250 to a couple of microns in length).…”

Model for Elastic Relaxation Phenomena in Finite 2D Hexagonal Molecular Lattices

“…These features made them candidates for a fully optical memory device, triggering an avalanche of studies with remarkable recent results of compounds that can be switched at room temperature [4], the production of spin-crossover nanoparticles [5] and the first optical switches between the two stable states of the material [6]. The transition between the two states is accompanied by changes in magnetic and optical properties as well as in the unit cell volume.…”

Molecules with Two Electronic Energy Levels: Study of Nanoparticles in the Atom‐Phonon Coupling Model Including a Surface Effect

“…The results contained in Figure 2 of ref. [8] can be compared with the results given in Figure 4 of the present study. Indeed, in Figure 2 of ref.…”

“…Indeed, in Figure 2 of ref. [8] there is an hysteresis loop centered around 296 K for macroscopic sizes and an hysteresis loop centered around 265k for 14 nm size. The ratio of both previous values is 1.12.…”