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We found an anisotropic hyperfine structure in the magnetically diluted alloy system, quasi-one-dimensional organic conductor, Co 0.01 Ni 0.99 Pc͑AsF 6 ͒ 0.5 (PcϭC 32 N 8 H 16 ), and confirmed that the doped CoPc was relevantly substituted. The hyperfine signal was replaced by a broad Lorentzian signal at ϳ30 K. The HЌc broad signal shifted and narrowed with increasing temperatures. We interpreted the temperature-dependent g value and linewidth based on Hasegawa's phenomenological theory for dilute magnetic alloys. The density of state at the Fermi level and the exchange energy between the local spin of Co 2ϩ and itinerant hole of the Pc chain were estimated, respectively, as D F ϭ3.8Ϯ0.2 eV and ͉J d ͉ϭ0.013Ϯ0.002 eV.

In single crystal as well as in polycrystallic samples of lead phthalocyanine of monoclinic and triclinic modification ESR signals are observed and their nature investigated. Structural change from monoclinic to triclinie modification of PbPc at 300 °C is observed. Optical absorption spectra within 200 to 1100 nm and 400 to 5000 cm−1 ranges are obtained. In μ‐PbPc thin films an anomalously wide and intense band due to intramolecular charge transfer is observed. IR reflection spectra of μ‐PbPc within the 400 to 5000 cm−1 range are registered, the plasma edge and a group of lines associated with symmetrical intermolecular vibration are found. Computation of reflection spectra by using Kramers‐Kronig relation is carried out. The frequency dependences of the real and imaginary parts of dielectric constant are computed. With use of the Drude‐Lorentz model the plasma vibrational parameters are determined.