Thermal, pressure and light switchable spin-crossover materials

Real, José Antonio; Gaspar, Ana B.; Muñoz, M. Carmen

doi:10.1039/b501491c

Cited by 669 publications

(486 citation statements)

References 145 publications

Supporting

Mentioning

462

Contrasting

Unclassified

Order By: Relevance

“…The resultant 1:1 compound is built up of slabs of [Fe(sal 2 -trien)] + cations and layers of [Ni(dmit) 2 ] -anions [11], which alternate along the c-axis and spread out onto the ab plane. In the HS state, the SC sites are constituted of severely distorted octahedral [FeN 4 O 2 ] centres, whereas in the LS state, the coordination octahedron is much more regular (Figure 1). This complex exhibits a first-order thermal phase transition with a large thermal hysteresis loop of the magnetic susceptibility, around 245 K (T ½ ↓=228 K and T ½ ↑=258 K) (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

Szilágyi¹,

Dorbes²,

Molnár³

et al. 2008

Journal of Physics and Chemistry of Solids

Self Cite

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A c c e p t e d m a n u s c r i p t

show abstract

Section: Introductionmentioning

confidence: 99%

“…Spin-crossover (SC) complexes of transition metal ions (3d 4 -3d 7 ) have attracted much attention from the fundamental point of view [1][2][3][4]. These complexes represent one of the best examples of molecular bistability.…”

Section: Introductionmentioning

confidence: 99%

Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

Szilágyi¹,

Dorbes²,

Molnár³

et al. 2008

Journal of Physics and Chemistry of Solids

Self Cite

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4] It has been a long standing dream to use this phenomenon in solid-state electronic devices. [5] Only recently several research groups succeeded in electrically addressing SCO materials based on Fe (II) coordination compounds at the nanoscopic [6][7][8] and microscopic [8][9][10] levels.…”

mentioning

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

Spin-crossover (SCO) materials form an intriguing class of compounds in which various external physical or chemical stimuli can change their ground spin state between a low-spin (LS) and a high-spin (HS) near room-temperature. [1][2][3][4] It has been a long standing dream to use this phenomenon in solid-state electronic devices. [5] Only recently several research groups succeeded in electrically addressing SCO materials based on Fe (II) coordination compounds at the nanoscopic [6][7][8] and microscopic [8][9][10] levels. This electric control of the spin has even been achieved in individual SCO molecules. [11,12] 2 The most investigated SCO systems are based on six-coordinated octahedral iron (II) complexes. In such systems, the spin state changes from the LS configuration, S = 0, to the HS one, S = 2; this SCO is accompanied by a change in the magnetic moment, the structure and color of the compound. Although the origin of this HS-LS transition is purely molecular, the SCO manifests cooperatively at the solid state and is strongly influenced by short/long range elastic interactions between neighboring SCO molecules. Such a cooperativity can result in a thermal hysteresis cycle, a property that can be used for memory applications in electronic devices. [5,13] In recent years the size of the SCO solid has been reduced to the nanoscale, while preserving the memory effect near room temperature. In particular, nanoparticles (NPs) of ~10 nm [14,15] have been obtained, based on the polymeric one-dimensional (1D) compound ([Fe(Htrz) 2 (trz)](BF 4 )), (Htrz = 1,2,4-triazole), [16,17] which is one of the most promising SCO systems for designing electronic devices working at room temperature. [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). Although it is tempting to attribute this difference to 3 separate transport mechanisms operating in these devices, i.e, single-step tunnelling vs. multistep hopping, differences in the chemical and structural NP features as well as in the experimental conditions may not...

show abstract

“…A possible approach to overcome this challenge consists of taking advantage of the sensitivity of spin-crossover complexes to subtle structural changes in metal coordination environments, which do not require magnetic cooperativity [13][14][15] . Thus, it has been shown that MOFs based on these molecular complexes exhibit magnetic switching at room temperature on physisorption of specific molecules within the porous framework 16,17 .…”

mentioning

confidence: 99%

Tuning the magneto-structural properties of non-porous coordination polymers by HCl chemisorption

et al. 2012

View full text Add to dashboard Cite

Responsive materials for which physical or chemical properties can be tuned by applying an external stimulus are attracting considerable interest in view of their potential applications as chemical switches or molecular sensors. A potential source of such materials is metalorganic frameworks. These porous coordination polymers permit the physisorption of guest molecules that can provoke subtle changes in their porous structure, thus affecting their physical properties. Here we show that the chemisorption of gaseous HCl molecules by a nonporous one-dimensional coordination polymer instigates drastic modifications in the magnetic properties of the material. These changes result from profound structural changes, involving cleavage and formation of covalent bonds, but with no disruption of crystallinity.

show abstract

Thermal, pressure and light switchable spin-crossover materials

Cited by 669 publications

References 145 publications

Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

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

Tuning the magneto-structural properties of non-porous coordination polymers by HCl chemisorption

Contact Info

Product

Resources

About