Thermodynamic stability and electrical conductivity of halogen complexes of organic solids.
Item
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Title
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Thermodynamic stability and electrical conductivity of halogen complexes of organic solids.
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Identifier
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AAI8801703
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identifier
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8801703
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Creator
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Degraff, Darnel.
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Contributor
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Adviser: Seymour Aronson
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Date
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1987
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Physical
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Abstract
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By means of a solid state electrochemical technique, we have measured the Gibbs free energy of formation for a number of charge-transfer complexes of nitrogen-bearing polymers and polycyclic compounds with molecular iodine or bromine. The polymers studied are: aniline black (AB), paracyanogen (Pcy), 2-polyvinylpyridine (PVP), cyclized-polyacrylonitrile (C-PAN), and polyquinoxaline. The polycyclic compounds comprise anthracene, phenazine, phenothiazine, phenanthridine, 1,10-phenanthroline, thianthrene, 7,8-benzoquinoline, indazole, benzotriazole, benzothiodiazole, benzimidazole, and phenanthrene.;The Emf data were obtained using solid state electrochemical cells of the type: ({dollar}-{dollar})Pt/Ag/AgI/I{dollar}\sb2{dollar}(P)/Pt(+) where I{dollar}\sb2{dollar}(P) represents either pure solid iodine or the iodine complexed with the organic solid, P. The results indicate that chemical bonding between iodine and the organic solids is weak. Bonding with bromine is stronger.;The electrical conductivities of these complexes were also measured using the Van der Pauw four-probe technique. The conductivities were found to be in the semiconducting range of 10{dollar}\sp{lcub}-7{rcub}{dollar} to 10{dollar}\sp{lcub}-2{rcub}{dollar} (ohm cm){dollar}\sp{lcub}-1{rcub}{dollar} with a strong dependence on the halogen content.;Electrochemical experiments were performed which demonstrate that conduction in these systems is primarily electronic.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
