Author: Paul R. Raithby

The diversity of coordination chemistry – A special issue in honor of Prof. Pierre Braunstein

2017

International audience

chemistry.chemical_classification010405 organic chemistryChemistrymedia_common.quotation_subjectLibrary science010402 general chemistry01 natural sciencesEngineering physics[ CHIM ] Chemical Sciences0104 chemical sciencesCoordination complexInorganic ChemistryHonorMaterials Chemistry[CHIM]Chemical SciencesPhysical and Theoretical ChemistryComputingMilieux_MISCELLANEOUSDiversity (politics)media_common

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Host molecules containing electroactive cavities obtained by the molecular assembly of redox-active ligands and metal ions

1995

Self-assembly processes of nickel ions with the redox-active ligand 1,4,8,11-tetra(ferrocenylmethyl)-1,4,8,11-tetraazacyclotetradecane (Fc4cyclam) induces the formation of a redox-active cavity of potential use in electrocatalysis.

ChemistryLigandMetal ions in aqueous solutionInorganic chemistryMolecular MedicineMoleculeRedox activeNickel ionsElectrocatalystCombinatorial chemistryJ. Chem. Soc., Chem. Commun.

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Two stage magnetic ordering and spin idle behavior of the coordination polymer Co3(OH)2(C4O4)2·3H2O determined using neutron diffraction.

2011

We report the magnetic structure of two of the magnetically ordered phases of Co(3)(OH)(2)(C(4)O(4))(2)·3H(2)O, a coordination polymer that consists of a triangular framework decorated with anisotropic Co(II) ions. The combination of neutron diffraction experiments and magnetic susceptibility data allows us to identify one phase as displaying spin idle behavior, where only a fraction of the moments order at intermediate temperatures, while at the lowest temperatures the system orders fully. This novel magnetic behavior is discussed within the framework of a simple Hamiltonian and representational analysis and rationalizes this multiphase behavior by considering the combination of frustratio…

Inorganic ChemistryIdlechemistry.chemical_compoundCondensed matter physicsMagnetic structureChemistryCoordination polymerNeutron diffractionPhysical and Theoretical ChemistryAnisotropyInorganic chemistry

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Cooperative High-Temperature Spin Crossover Accompanied by a Highly Anisotropic Structural Distortion

2016

Spin transitions are a spectacular example of molecular switching that can provoke extreme electronic and structural reorganizations in coordination compounds. A new 3D cyanoheterometallic framework, [Fe(pz)(Au(CN)2)2], has been synthesized in which a highly cooperative spin crossover has been observed at 367 and 349 K in heating and cooling modes, respectively. Mössbauer spectroscopy revealed a complete transition between the diamagnetic and paramagnetic states of the iron centres. The low-spin-to-high-spin transition induced a drastic structural distortion involving a large one-directional expansion (ca. 10.6%) and contraction (ca. 9.6%) of the lattice. Negative thermal expansion along th…

chemistry.chemical_classificationCondensed matter physicsCooperative effects010405 organic chemistryChemistryTransition temperatureIronMetal-organic frameworks010402 general chemistrySpin crossover01 natural sciences0104 chemical sciencesCoordination complexInorganic ChemistryParamagnetismNuclear magnetic resonanceNegative thermal expansionSpin crossoverQD156Mössbauer spectroscopyMagnetic propertiesQD473DiamagnetismAnisotropy

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