Abstract
Abstract The ESR spectrum of bis(dibenzoylmethanato)oxovanadium(IV) dissolved in a number of pyrene and fluoranthene complexes with aromatic polynitro compounds just above their melting points indicates that the motion of the spin probe is more or less restricted. In some favorable cases, the high effective viscosity of the melts can be partially attributed to the association of the electron donor and acceptor molecules. No abrupt change in the ESR spectral pattern is noted upon solidification and the motion of the probe gradually ceases upon lowering the temperature. Therefore, the lattice appears to be not rigid in these crystalline complexes. On the other hand, the ESR spectrum observed in the molten naphthalene-dinitrophenol complex is not far from isotropic at the melting point. Because of the segregation of the probe upon solidification, the measurements on this solid complex could not be made.
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