Search results for "Mixed valent"

showing 4 items of 4 documents

High-spin wheel of a heptanuclear mixed-valent Fe(II,III) complex.

2003

Mixed valentComputational chemistryChemical physicsChemistryGeneral ChemistrySpin (physics)CatalysisAngewandte Chemie (International ed. in English)
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Formation and mixed-valent behaviour of a substituted tetraferrocenylstannane.

2010

A tetrasubstituted tetraferrocenylstannane is formed from 1-bromoferrocene-1′-carboxylic acid methyl ester and copper bronze. The molecular structure is almost perfectly tetrahedral with Fe⋯Fe distances of around 6 A. In solution two sequential one-electron processes and one two-electron process are indicative of mixed-valent intermediates. Intermetallic interactions have been probed by preparative oxidation, paramagnetic NMR spectroscopy, Mosbauer spectroscopy, UV/Vis/NIR spectroscopy and DFT calculations.

Models MolecularMolecular StructureNear-infrared spectroscopyMetals and AlloysAnalytical chemistryIntermetallicchemistry.chemical_elementTin CompoundsGeneral ChemistryNuclear magnetic resonance spectroscopyCrystallography X-RayCopperCatalysisSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCrystallographyParamagnetismchemistryMixed valentMaterials ChemistryCeramics and CompositesMoleculeFerrous CompoundsSpectroscopyChemical communications (Cambridge, England)
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Structure and electrical resistivity of mixed-valent EuNi2P2 at high pressure.

2014

The structural properties and electrical resistivity of homogeneous mixed-valent EuNi2P2 are studied at pressures up to 45 GPa. No structural phase transition is observed in the whole pressure range and the overall pressure behavior of the structural parameters is similar to that of related compounds in the collapsed tetragonal ThCr2Si2-type structure. Electrical resistivity measured up to 31 GPa at temperatures between 4 and 300 K exhibits continuous changes from the behavior typical for a mixed-valent Eu system to that of a normal metallic system at pressures above 20 GPa, indicating a transition of the strongly mixed-valent Eu atoms with a valence ~2.5 towards a pure trivalent state. No …

SuperconductivityValence (chemistry)Materials scienceCondensed matter physicsCondensed Matter PhysicsPressure rangeMetalTetragonal crystal systemMixed valentElectrical resistivity and conductivityvisual_artHigh pressurevisual_art.visual_art_mediumGeneral Materials ScienceJournal of physics. Condensed matter : an Institute of Physics journal
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A novel mixed valent Cu(II)-Cu(I) 2D framework made of a hydrazone and μ-SCN bridged metallacyclic loops cross-linked by μ3-SCN chains.

2012

A mixed valent copper complex [Cu(II)Cu(I)(L)(μ-SCN)(μ(3)-SCN)](n) (LH = N'-((pyridin-2-yl)methylene)acetohydrazide) has been synthesized and characterized. It is a unique example of a 2D mixed valent Cu(II)-Cu(I) interlinked molecular assembly with a very unusual bridging property of the hydrazone ligand. An extraordinary in situ partial Cu(II)→ Cu(I) reduction is observed in this system at room temperature.

chemistry.chemical_classificationIonsCopper complexStereochemistryPyridinesHydrazonesMolecular ConformationTemperatureHydrazoneCrystallography X-RayLigandsInorganic Chemistrychemistry.chemical_compoundCrystallographychemistryMixed valentCoordination ComplexesHydrazone ligandMethyleneCopperDalton transactions (Cambridge, England : 2003)
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