Electrical conductivity of vacuum deposited films and crystals of redox-isomeric о-semiquinonato cobalt complexes

• Temperature dependence of electrical conductivity of crystals has maximum.
• Molecules composing the crystals undergo redox-isomeric interconversion.
• Maximum of conductivity is inside of temperature interval of redox-isomeric interconversion.
• Conductivity of crystals at high temperature slope after maximum falls to “zero”.
• Drop of relative conductivity of crystals reaches 10% per degree.

A study of the temperature dependences of electrical conductivity of crystalline and thin-film samples of о-semiquinonato complexes of cobalt (2,2′-bpy)Co(3,6-DBSQ)2 (complex 1) and (1,10-phen)Co(3,6-DBSQ)2 (complex 2) is reported; where 3,6-DBSQ is 3,6-di-tert-butyl-benzoquinone-1,2. It was shown that the electrical conductivity of samples having amorphous, polycrystalline and monocrystalline structure depends on temperature in the range 150–400 K in a different way. The abrupt drop of conductivity (up to 10% per a degree) was observed in crystalline samples in the region of phase transition (270–310 K for complex 1 and 140–230 K for complex 2). It makes such materials promising for design of uncooled matrix bolometers.

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