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A new electroactive material has been prepared by attaching the potassium salt of 1,3-di(/>-methoxyphenyl)-5-(/?hydroxyphenyl)-A2-pyrazoline to cross-linked chloromethylated polystyrene resins. The polymer Can be readily coated from benzene suspensions onto metallic electrodes. At these modified electrodes, electrochemical charge transfer reactions are accompanied by large optical changes as pyrazoline cations are formed through the film bulk. Studies of the electrochemical and optical changes as a function of sweep rate and time indicate that electrons are transferred between monomeric pyrazoline species, and that the polymer matrix is characterized by a considerable degree of donor site flexibility.

to be published. This method is specially designed to solve the energy-band problem over an extended energy range and can describe simultaneously several principal quantum numbers of the eigenstates. Detailed absorption spectra calculations for the 3d and 4d transition metals have already been published:

Considerable interest has been shown recently in the study of highly conducting organic charge transfer salts.2 The most attractive of these systems is the salt foimed between tetrathiofulvalene (TTF, 1) and tetracyano-p-quinodimethane (TCNQ, 2), which displays exceptional electrical conductivity (amax,58°K ca.