The Journal of Chemical Physics · 1957 · 132 citations · 2 references
Natural SciencesChemistryPhysicsOrganic ChemistryPhysical ChemistrySpectroscopyIntermolecular InteractionsMagnetic Properties Of SolidsMagnetism Of Inorganic CompoundsMolecular Orbital TheoryMolecular SymmetryAbsorption Band AssignmentCharge-transfer SpectroscopyCharge-transfer StatesMagnetic PropertiesOrganic Radical Spectroscopyπ Interactionsπ-π Interactions
The spectroscopic and magnetic properties of N-ethylphenazyl and Wurster's blue perchlorate show characteristic changes at low temperatures. Using Mulliken's charge-transfer theory, we have shown that the formation of π complexes can account for these changes. The intense long wavelength absorption band which appears at low temperatures in both cases, is attributed to a transition to a state which is an antisymmetrical combination of two charge-transfer configurations, in which all the electrons are paired. We have compared the properties of these π complexes with the properties of the biradicals related to 4,4′-bis-diphenylmethylenediphenyl (chichibabin hydrocarbon.)
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