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Molybdenum disulfide has been intercalated with calcium and strontium by means of the liquid ammonia technique. Chemical, x−ray, and superconductivity data are presented. The x−ray data reveal a lowering of crystal symmetry and increase of complexity of the structure upon intercalation with the alkaline earth metals. The Ca and Sr intercalates start to superconduct at ∼4 and 5.6°K, respectively, and show considerable anisotropy regarding the critical magnetic field.

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The synthesis and transport properties of the salts (TTF) (iodine)x have been investigated. These salts are quasi-one-dimensional compounds containing cation radicals only, in contrast to the cation radical–anion radical systems such as (TTF)(TCNQ). The phase diagram of (TTF)(I)x is discussed, and found to consist of two conducting, stoichiometric phases, x=2.0 and 3.0, and two nonconducting, nonstoichiometric phases, x=0.71 and 2.3. The transport properties of (TTF)(I)0.71 are discussed in detail. This phase is highly conducting, σRT∼350 Ω−1⋅cm−1, undergoes a sharp transition to a less conducting state at ∼210 °K, and exhibits an unusual hysteresis in some of the transport properties upon thermal cycling. The nature of the high temperature ground state is examined.

Electrically conducting polymeric salts were prepared by the reaction of ionene polymers with LiTCNQ in the presence or absence of neutral TCNQ. The specific resistivity, the activation energy for conductivity, and the Seebeck coefficient were determined as a function of the number of CH2 groups between positively charged nitrogens. The wide variations of electrical properties could not be correlated with the length of the polymethylene chain in the polymer. X-Ray analysis of single crystals of model compounds revealed that the electrical properties depend mainly on crystal geometry.