A5085901365- Magnetism in coordination complexes
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Lanthanide and Transition Metal Complexes
- Metal complexes synthesis and properties
- Electron Spin Resonance Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Organic and Molecular Conductors Research
- Metal-Catalyzed Oxygenation Mechanisms
- Crystallography and molecular interactions
- Crystal structures of chemical compounds
- Synthesis and Characterization of Heterocyclic Compounds
- Advanced NMR Techniques and Applications
- Molecular Junctions and Nanostructures
- Catalysis and Oxidation Reactions
- Inorganic Chemistry and Materials
- Petroleum Processing and Analysis
- Catalytic Processes in Materials Science
- Advanced Condensed Matter Physics
- Nonlinear Optical Materials Research
- Catalysts for Methane Reforming
- Fluorine in Organic Chemistry
- Advanced Memory and Neural Computing
- Magnetic and transport properties of perovskites and related materials
- Enhanced Oil Recovery Techniques
Aston University
2004-2024
University of Groningen
2004-2019
University of Ioannina
2006-2019
Centre National de la Recherche Scientifique
1997-2009
Laboratoire de Chimie de Coordination
2008-2009
Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux
2009
Université Toulouse III - Paul Sabatier
2009
Johannes Gutenberg University Mainz
1998-2008
Universidad de Zaragoza
2008
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2008
[Fe(btzp)3](ClO4)2 (btzp = 1,2-bis(tetrazol-1-yl)propane) represents the first structurally characterized Fe(II) linear chain compound exhibiting thermal spin crossover. It shows a very gradual transition (T1/2 130 K) which has been followed by magnetic susceptibility measurements and 57Fe Mössbauer spectroscopy. The structure solved at 200 100 K single-crystal X-ray analysis. crystallizes in trigonal space group P3c1 with Z 2 units both temperatures. molecular consists of chains running...
The compound [Fe(abpt)2(TCNQ)2], where TCNQ is the radical anion 7,7',8,8'-tetracyanoquinodimethane and abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole, an Fe(II) complex containing coordinated anions which undergoes a thermally induced spin-crossover with Tc 280 K. Variable-temperature magnetic susceptibility (7−460 K) 57Fe Mössbauer spectroscopy data give evidence for complete S 2 (high-spin) ↔ 0 (low-spin) transition, taking place gradually, without hysteresis. X-ray structure has...
[Fe(hyetrz)3](3-nitrophenylsulfonate)2·3H2O (1·3H2O), with hyetrz = 4-(2‘-hydroxyethyl)-1,2,4-triazole, has been synthesized, and its physical properties have investigated several techniq...
[Fe(hyetrz) 3 ](anion) 2 ·3H O [hyetrz=4-(2′-hydroxyethyl)-1,2,4-triazole, anion=3-nitrophenylsulfonate] is a novel linear polynuclear Fe II spin-crossover compound. The low-spin to high-spin transition accompanied by pronounced thermochromic effect occurs at 370 K in very abrupt way. Just before this temperature, the three non-coordinated water molecules are removed. dehydrated form remains stable down ca. 100 K, where it transforms into new form, implying that material shows an apparent...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetism of A-copper(II) bimetallic chain compounds (A = iron, cobalt, nickel): one- and three-dimensional behaviorsPetra J. Van Koningsbruggen, Olivier Kahn, Keitaro Nakatani, Yu Pei, Jean Pierre Renard, Marc Drillon, Patrick LegollCite this: Inorg. Chem. 1990, 29, 18, 3325–3331Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September...
[Cu(hyetrz)3](ClO4)2·3H2O (hyetrz = 4-(2-hydroxyethyl)-1,2,4-triazole) represents the first structurally characterized metal(II) chain compound containing triple N1,N2-1,2,4-triazole bridges. The structure has been solved at 298 K by single-crystal X-ray analysis. catena-Poly[μ-tris(4-(2-hydroxyethyl)-1,2,4-triazole-N1,N2)copper(II)] diperchlorate trihydrate (C12H27N9Cl2O14Cu) crystallizes in monoclinic space group P21/n, a 13.877(3) Å, b 23.023(5) c 15.351(2) β 91.10(2)°, Z 8 (Cu(II)...
[micro-Tris(1,4-bis(tetrazol-1-yl)butane-N4,N4')iron(II)] bis(hexafluorophosphate), [Fe(btzb)(3)](PF(6))(2), crystallizes in a three-dimensional 3-fold interlocked structure featuring sharp two-step spin-crossover behavior. The spin conversion takes place between 164 and 182 K showing discontinuity at about T(1/2) = 174 hysteresis of 4 the low-spin state. transition has been independently followed by magnetic susceptibility measurements, (57)Fe-Mössbauer spectroscopy, variable temperature...
Three polymorphic modifications A−C of [FeII(DPPA)(NCS)2], where DPPA = (3-aminopropyl)bis(2-pyridylmethyl)amine is a new tetradentate ligand, have been synthesized, and their structures, magnetic properties, Mössbauer spectra investigated. For polymorph A, variable-temperature susceptibility measurements as well spectroscopy revealed the occurrence rather gradual HS ⇔ LS transition without hysteresis, centered at about 176 K. The same methods shown that B paramagnetic over temperature range...
A new series of iron(ii) spin-crossover materials formula [Fe(NH2trz)3 ]X2xH2O [X=1-naphthalene sulfonate (1ns), 2-naphthalene (2ns), 4-hydroxy-1-naphthalene (4OH-1ns), 4-amino-1-naphthalene (4NH2-1ns) and 6-hydroxy-2-naphthalene (6OH-2ns)] are reported. The structure these compounds consists linear chains in which the Fe(ii) ions linked by triple N1 ,N2-1,2,4-triazole bridges. All show non-classical behaviour. Optical magnetic measurements recorded upon heating an abrupt low-spin to...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotropic and Anisotropic Magnetic Exchange Interactions through .mu.-N1,N2 1,2,4-Triazole .mu.-Sulfato Bridges: X-ray Crystal Structure, Properties, Single-Crystal EPR Study of (.mu.-4-Amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole-N',N1,N2,N'')(.mu.-sulfato-O,O')[(sulfato-O)aquacopper(II)]triaquacopper(II) HydratePetra J. van Koningsbruggen, Dante Gatteschi, Rudolf A. G. de Graaff, Jaap Haasnoot, Jan Reedijk, Claudia ZanchiniCite this: Inorg. Chem....
The structure and spin-crossover magnetic behavior of [Fe(II)1(6)][BF(4)](2) (1 = isoxazole) [Fe(II)1(6)][ClO(4)](2) have been studied. undergoes two reversible transitions at 91 192 K, is the first two-step spin transition to undergo a simultaneous crystallographic phase transition, but does not exhibit thermal hysteresis. single-crystal determinations 260 [space group P3, 17.4387(4) A, c 7.6847(2) A] 130 K P1, 17.0901(2) b 16.7481(2) 7.5413(1) alpha 90.5309(6) degrees, beta 91.5231(6)...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotropic Magnetic Exchange Interaction through Double .mu.-1,2,4-Triazolato-N1,N2 Bridges: X-ray Crystal Structure, Properties, and EPR Study of Bis(.mu.-3-pyridin-2-yl-1,2,4-triazolato-N',N1,N2)(sulfato-O)aquacopper(II)diaquacopper(II) TrihydratePetie M. Slangen, Petra J. van Koningsbruggen, Kees Goubitz, Jaap G. Haasnoot, Jan ReedijkCite this: Inorg. Chem. 1994, 33, 6, 1121–1126Publication Date (Print):March 1, 1994Publication History Published...
Single crystals of RbMn[Fe(CN)6]·H2O reveal temperature-dependent partial reversible switching from the high- (LS FeIII and HS MnII) to low-temperature configuration FeII MnIII). This can be explained by proposing iron sites differing in electron transfer capability. At 4 K, optical high-temperature is detected.
A series of novel polymeric compounds formula [M(btzb)3][ClO4]2 (MII = Fe, Ni or Cu) with btzb 1,4-bis(tetrazol-1-yl)butane have been prepared and their physical properties investigated. The ligand has its crystal structure determined, together a tentative the 3-D compound [Fe(btzb)3][ClO4]2. model latter shows two symmetry-related, interpenetrating Fe–btzb networks in which iron(II) ions approach each other as close 8.3 9.1 Å. This supramolecular catenane undergoes sharp thermal spin...
The new spin transition compound [FeII(DPEA)(NCS)2], where DPEA [(2-aminoethyl)bis(2-pyridylmethyl)amine] is a tetradentate ligand, has been synthesized, and its structure, magnetic properties, Mössbauer spectra have investigated. crystal structure determined by X-ray diffraction at 298 K. crystallizes in the monoclinic system, space group P21/c, with Z = 4, 9.358(1) Å, b 11.812(2) c 17.135(2) β 94.5(4)°. distorted [FeN6] octahedron formed from four nitrogen atoms belonging to two provided...
The reaction of btzmp (1,2-bis(tetrazol-1-yl)-2-methylpropane) with Fe(ClO4)2 generates a 1D polymeric species, [Fe(μ-btzmp)2(btzmp)2](ClO4)2, showing steep spin transition (T1/2↑ = 136 K and T1/2↓ 133 K) 3 thermal hysteresis. crystal structure at 100 200 reveals that, in contrast to other bistetrazole based spin-transition systems such as [Fe(endi)3](BF4)2 [Fe(btzp)3](ClO4)2, the present compound has only two ligands bridging metallic centres, while coordination positions are occupied by...
Charge transport and dielectric measurements were carried out on compacted powder single-crystal samples of bistable RbxMn[Fe(CN)6]y·zH2O in the two valence-tautomeric forms (MnIIFeIII MnIIIFeII) as a function temperature (120−350 K) frequency (10−2−106 Hz). The complex conductivity data reveal universal behavior obey Barton−Nakajima−Namikawa relationship. charge is accompanied by relaxation that displays same thermal activation energy conductivity. Surprisingly, was found very similar...
A novel tetranuclear, mixed-valence compound, CuI2CuII2(LL)2Cl6 (LL = dinucleating 4-amino-3,5-bis[(N-methylamino)methyl]-1,2,4-triazole), is described. The molecule consists of a rhomboid four Cu ions, with short Cu(I)−Cu(II) contacts 3.875(1) and 4.022(1) Å Cu(II)−Cu(II) distance 4.048(1) Å. An unusual "sandwich" interaction 3.193(1) occurs between CuICl32- the 1,2,4-triazole ring. unpaired electrons are localized on two Cu(II) which antiferromagnetically coupled.