The compound [Fe(tvp)(2)(NCS)(2)] . CH(3)OH, where tvp is 1,2-di-(4-pyridyl)-ethylene, has been synthesized and characterized by x-ray single-crystal diffraction. It consists of two perpendicular, two-dimensional networks organized in parallel stacks sheets made up edge-shared [Fe(II)](4) rhombuses. fully interlocked define large square channels the [001] direction. Variable-temperature magnetic susceptibility measurements Mössbauer studies reveal that this shows low-spin to high-spin...

In this paper, we present a comprehensive review of research on electrical and charge transport properties spin crossover complexes. This includes both the effect spin-state switching dielectric permittivity conductivity material vice versa influence an applied field (or current) system. The survey covers different size scales from bulk materials thin films to nanoparticles single molecules embraces presentation several device prototypes hybrid as well.

In the loop: A reversible spin transition was observed by Raman spectroscopy on application of a single laser pulse (8 ns) in hysteresis loop spin-crossover complex [Fe(pyrazine){Pt(CN)4}]. This bi-directional, photoinduced switching occurs at room temperature over wide region bistability and involves magnetization as well color changes (see picture).

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-step spin crossover in the new dinuclear compound [Fe(bt)(NCS)2]2bpym, with bt = 2,2'-bi-2-thiazoline and bpym 2,2'-bipyrimidine: experimental investigation theoretical approachJose Antonio Real, Helene Bolvin, Azzedine Bousseksou, Ary Dworkin, Olivier Kahn, Francois Varret, Jacqueline ZarembowitchCite this: J. Am. Chem. Soc. 1992, 114, 12, 4650–4658Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published...

Assembly time: Thin films of [Fe(pyrazine){M(CN)4}] (M=Ni, Pd, or Pt) coordination polymers were assembled sequentially through coordinate bonding on gold surfaces (see scheme). These multilayers exhibit spin-crossover phenomena with hysteresis at room temperature. Supporting information for this article is available the WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z601885_s.pdf from author. Please note: The publisher not responsible content functionality any supporting supplied...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin Transitions and Thermal Hysteresis in the Molecular-Based Materials [Fe(Htrz)2(trz)](BF4) [Fe(Htrz)3](BF4)2.cntdot.H2O (Htrz = 1,2,4-4H-triazole; trz 1,2,4-triazolato)Jonas Kroeber, Jean-Paul Audiere, Renee Claude, Epiphane Codjovi, Olivier Kahn, Jaap G. Haasnoot, Francoise Groliere, Charlotte Jay, Azzedine Bousseksou, Cite this: Chem. Mater. 1994, 6, 8, 1404–1412Publication Date (Print):August 1, 1994Publication History Published online1 May...

Spin crossover materials made of metallo-organic/inorganic molecular complexes present magnetic susceptibility and optical reflectivity hysteresis due to an internal high-spin (HS) low-spin (LS) cooperative spin transition with potential applications in memory, display switching devices. Here, we report the first observation a thermal bistability dielectric constant as consequence HS LS transition. Better than or reflectivity, this electrical property allows effective use such for...

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Micro- and nanometer-sized patterns of the spin-crossover compound Fe(pyrazine)[Pt(CN)4] have been fabricated using a combination lift-off multilayer sequential assembly methods. These (see figure inside cover) exhibit bistability their electronic states and, thus, represent novel platform for wide array potential applications.

Abstract The spin crossover phenomenon in molecular inorganic compounds is one of the most spectacular examples bistability phenomena leading to a switching between high‐spin and low‐spin states molecule by several means such as temperature, pressure, light magnetic field (multi‐property switching). In present microreview we report our important findings, both experimental results theoretical approaches, discuss possible technological applications for each method well recent synthesis new...

Take it to the limit: Monodisperse nanoparticles of 3D coordination polymer [Fe(pyrazine){Ni(CN)4}] have been obtained in biopolymer chitosan beads matrix (see picture). These ultra-small (ca. 4 nm) exhibit spin crossover phenomenon with hysteresis. Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z802906_s.pdf or from author. Please note: The publisher not responsible content functionality any supporting supplied by authors. Any...

Single crystals of the {FeII(pyrazine)[Pt(CN)4]} spin crossover complex were synthesized by a slow diffusion method. The exhibit thermal transition around room temperature (298 K), which is accompanied 14 K wide hysteresis loop. X-ray single-crystal analysis confirms that this compound crystallizes in tetragonal P4/mmm space group both states. Within region complete bidirectional photoconversion was induced between two phases (high ⇄ low spin) when short single laser pulse (4 ns, 532 nm)...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-step spin conversion of [FeII(5-NO2-sal-N(1,4,7,10))]: 292, 153, and 103 K x-ray crystal molecular structure, infrared, magnetic, Moessbauer, calorimetric, theoretical studiesDidier Boinnard, Azzedine Bousseksou, Ary Dworkin, Jean Michel Savariault, Francois Varret, Pierre TuchaguesCite this: Inorg. Chem. 1994, 33, 2, 271–281Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January...

In the past few years we have witnessed spectacular development of nano-materials spin crossover complexes 3d4–3d7 transition metal ions, including thin films, nanoparticles, nanopatterns and nanoscale assemblies. These developments were primarily motivated by fundamental questions concerning size reduction effects on bistability properties. On other hand, nano-objects require new characterization techniques (scanning probe microscopy, micro-magnetometry, etc.), revealing unknown details SCO...

Three novel three-dimensional coordination polymers, {FeII(azpy)[(MII(CN)4)]}·nH2O (azpy = 4,4′-azopyridine; M Ni, Pd, and Pt), have been synthesized as polycrystalline bulk materials continuous well nanopatterned thin films on gold substrates. Single crystals of the Pt derivative also isolated corresponding X-ray diffraction analysis at 140 K indicates that it crystallizes in tetragonal P4/mmm space group with a b 7.1670(5) Å, c 13.0330(13) V 669.40(9) Å3 Z 1. Four square-planar [Pt(CN)4]2−...

Abstract From the development of new methods for synthesis and patterning nanometre‐scale thin films particles, to first investigations charge transport photonic properties, there has been a proliferation research concerning spin crossover nanomaterials in recent years. Studies have aimed at addressing fundamental questions size‐reduction effects, as well striving towards practical applications this important class bistable molecular materials. This microreview describes most achievements...

The two-step spin crossover of a new mononuclear iron(II) complex is studied by magnetic, crystallographic and calorimetric methods revealing two successive first-order phase transitions an ordered intermediate built the repetition unprecedented [HS–LS–LS] motif.

Temperature plays a fundamental role in all fields of science; hence the development methods for measuring this property remains vogue. Within vast field, fluorescent thermometry appears as simple, noninvasive and cost-effective method providing good spatial, temporal thermal resolution both solid liquid phases, even distant or inaccessible environments. Here we describe properties two-component system comprised Fe(II)-triazole type spin-crossover nanoparticles (temperature sensor) an...

Much research has been directed toward the development of electrically switchable optical materials for applications in memory and display devices. Here we present experimental evidence an electric-field-induced charge-transfer phase transition two cyanometalate complexes: Rb(0.8)Mn[Fe(CN)(6)](0.93).1.62H(2)O Co(3)[W(CN)(8)](2)(pyrimidine)(4).6H(2)O, involving changes their magnetic, optical, electronic properties as well. Application electric field above a threshold value within thermal...

We studied the spin state dependence of electrical conductivity crossover compound [Fe(Htrz)2(trz)](BF4) (Htrz = 1H-1,2,4-triazole) by means dc measurements. The low is characterized higher conductance and lower thermal activation energy conductivity, when compared to high state.