A5104753525- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electron Spin Resonance Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Organic and Molecular Conductors Research
- Molecular Junctions and Nanostructures
- Multiferroics and related materials
- Gas Sensing Nanomaterials and Sensors
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Synthesis of Ferrites
- Magnetic properties of thin films
- Advanced Sensor and Energy Harvesting Materials
- Porphyrin and Phthalocyanine Chemistry
- Dielectric materials and actuators
- Advanced NMR Techniques and Applications
- Polyoxometalates: Synthesis and Applications
- Synthesis and Characterization of Heterocyclic Compounds
- Synthesis and biological activity
- Theoretical and Computational Physics
- Molecular Sensors and Ion Detection
- Conducting polymers and applications
Ştefan cel Mare University of Suceava
2016-2025
Université de Versailles Saint-Quentin-en-Yvelines
2008-2011
University of New Orleans
2010-2011
Groupe d’Étude de la Matière Condensée
2006-2011
Centre National de la Recherche Scientifique
2008-2011
Alexandru Ioan Cuza University
2004-2011
University of Michigan
2011
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.
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.
The nanoscale manipulation and charge transport properties of the [Fe(Htrz)2(trz)](BF4) spin-crossover compound is demonstrated. Such 1D nanostructures are attractive building blocks for nanoelectronic switching memory devices.
The thermally induced hysteretic spin transition (ST) that occurs in the polymeric chain compound [Fe(NH2trz)3](NO3)2 (1) above room temperature (Tc↑ = 347 K, Tc↓ 314 K) has been tracked by 57Fe Mössbauer spectroscopy, SQUID magnetometry, differential scanning calorimetry (DSC), and X-ray powder diffraction (XPRD) at variable temperatures. From XRPD pattern indexation, an orthorhombic primitive cell was observed with following parameters: a 11.83(2) Å, b 9.72(1) c 6.361(9) Å 298 K (low-spin...
The fabrication of large-area vertical junctions with a molecular spin-crossover complex displaying concerted changes spin degrees freedom and charge-transport properties is reported. Fabricated devices allow spin-state switching in the layer to be triggered probed by optical means, while detecting associated electrical resistance junctions. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may re-organized for...
One-dimensional (1D) coordination polymers of formula [Fe(NH(2)trz)(3)]A.nH(2)O, {A = TiF(6)(2-), n 0.5 (1) and 1 (2); A ZrF(6)(2-), (3) 0 (4); SnF(6)(2-), (5) (6); TaF(7)(2-), 3 (7) 2.5 (8); GeF(6)(2-), (9) (10), NH(2)trz 4-amino-1,2,4-triazole} have been synthesized, fully characterized, their spin crossover behavior carefully studied by SQUID magnetometry, Mossbauer spectroscopy, differential scanning calorimetry. These materials display an abrupt hysteretic transition around 200 K on...
Abstract A detailed investigation on the properties of high‐temperature and low‐temperature modifications iron(II) spin‐crossover complex [FeL1(HIm) 2 ] ( 1) its isotopic deuterium‐labelled analogue [FeL1(DIm) 1 D), pair [FeL2(azpy)] · MeOH/[FeL2(azpy)] CD 3 OD/[FeL2(azpy)] 2· MeOH/ OD/ ), in which L1 L2 are tetradentate N O 2– ‐coordinating Schiff base like ligands, = {diethyl( E , )‐2,2′‐[1,2‐phenylbis(iminomethylidyne)]bis[3‐oxobutanoate](2–)‐ ′, ′},...
The possibility of a new design concept for dual spin crossover based sensors concomitant detection both temperature and pressure is presented. It conjectured from numerical results obtained by mean field approximation applied to Ising-like model that using two different compounds containing switching molecules with weak elastic interactions it possible simultaneously measure P T. When the interaction parameters are optimized, transition gradual each compounds, values being identified their...
We present a new colorimetric chemosensor of formula [Fe(H2btm)2(H2O)2]Cl2 (1) (H2btm = di(1H-tetrazol-5-yl)methane), allowing to detect at real time, with high selectivity and ultra-sensitivity, 14 different volatile organic compounds (VOCs) hazardous gases (HGs), in particular amines, which are detected very quickly (<2 min) sensitivity (0.58 ppm for ammonia (NH3), 0.62 hydrazine (NH2–NH2), 0.45 isobutylamine, 0.71 diethylamine). The detection is accompanied by significant fast color...
Hofmann coordination polymers (CPs) that couple the well-studied spin transition of FeII central ion with electron-responsive ligands provide an innovative strategy toward multifunctional metal-organic frameworks (MOFs). Here, we developed a 2D planar network consisting metal-cyanide-metal sheets in unusual mode, brought about by infinitely π-stacked redox-active bipyridinium derivatives as axial ligands. The obtained family materials show vivid thermochromism attributed to electron transfer...
Interactions and magnetization reversal of Ni nanowire arrays have been investigated by the first-order curve (FORC) method. Several series samples with controlled spatial distribution were considered including simple wires different lengths diameters (70 110 nm) complex a single modulated diameter along their length. Subtle features magnetic interactions are revealed through quantitative analysis local interaction field profile distributions obtained from FORC In addition, indicates that...
A mononuclear iron(II) neutral complex (1) is screened for sensing abilities a wide spectrum of chemicals and to evaluate the response function toward physical perturbation like temperature mechanical stress. Interestingly, 1 precisely detects methanol among an alcohol series. The process visually detectable, fatigue-resistant, highly selective, reusable. ability attributed molecular sieving subsequent spin-state change iron centers, after crystal-to-crystal transformation.
We have investigated the suitability of using 1D spin crossover coordination polymer [Fe(4-(2'-hydroxyethyl)-1,2,4-triazole)3]I2∙H2O, known to around room temperature, as a pressure sensor via optical detection various contact pressures up 250 MPa. A dramatic persistent colour change is observed. The experimental data, obtained by calorimetric and Mössbauer measurements, been used for theoretical analysis, in framework Ising-like model, thermal induced state switching. (P)-temperature (T)...
Water is crucial in exerting a confinement pressure or matrix effect on the spin transition of SCO material MCM-41.
We report large-area (∼3 mm2), pinhole free crossbar junctions of thin films the molecular complex [Fe(HB(tz)3)2] displaying spin transition around 336 K. The charge transport in thinner (10 and 30 nm) occurs by a tunneling mechanism, which is not affected substantially transition. thicker (100 200 exhibit rectifying behavior reproducible drop their electrical resistance ca. 65–80% when switching molecules from high-spin to low-spin state. This current modulation ascribed bulk-limited...
The functional properties of a series BaTiO3 ceramics, having grain sizes ranging from 75 nm to 2.25 μm, with polymorph coexistence around room temperature are presented. Large ranges phase were detected through structural analyses, no apparent size effect on the extension co-existence domain, while transition temperatures vary size. Permittivity values among highest reported and typical maximum 1 μm is confirmed by low field measurements sub-switching Rayleigh analysis. An interesting...
A chiral supramolecular Fe II 4 L metal-organic cage able to detect NH 3(g) at room temperature with fast response time and superior selectivity, which we used monitor food safety 4°C on fresh bacon bits.