Bulletin of the Chemical Society of Japan · 1969 · 139 citations · 20 references
Natural SciencesChemistryPhysicsCondensed Matter PhysicsPhysical ChemistrySolid-state ChemistryCrystal ChemistryCrystalline MaterialsElectronic Structure Of SolidsInorganic SpectroscopyMagnetic Properties Of SolidsMagnetism Of Inorganic CompoundsAnion ConductorsConductivityCrystal Structure-property RelationshipsDiffuse Reflectance SpectroscopyElectronic Absorption SpectraMagnetic PropertiesPhysical PropertiesReflectance
Abstract The present paper deals with crystalline TCNQ, anion radical “simple” salts of M+ TCNQ\divdot, where M+ represents a diamagnetic counter cation. Their crystalline electronic spectra were measured in the range between 4.0 and 30.8 kK by means of diffuse reflectance. The crystalline spectra thus obtained were quite different from that of the TCNQ, radical anion monomer and exhibited a broad and intense low-energy band around 9 kK in the low-conductivity compounds and at 4.3 kK in the high-conductivity compound. These bands were ascribed to inter-radical charge-transfer in the solid state. The crystalline spectra were found to be closely correlated to their unusual electrical and magnetic properties. It was concluded that these physical properties were based on a unique TCNQ molecular arrangement in groups of several or an infinite number of face-to-face molecular systems.
20