Accession Number : ADA110192


Title :   Rational Control of Electronic Structure and Lattice Architecture in Electrically Conducting Molecular/Macromolecular Assemblies.


Descriptive Note : Interim rept.,


Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY


Personal Author(s) : Marks,Tobin J ; Dirk,Carl W ; Schoch,Karl F , Jr ; Lyding,J W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a110192.pdf


Report Date : 23 Dec 1981


Pagination or Media Count : 25


Abstract : This article discusses an approach to control molecular stacking interactions in low-dimensional mixed molecular assemblies by locking partially oxidized metallomacrocycles together in a face-to-face orientation. Thus, doping of the cofacially linked polymers M(Pc)O sub n (M = Si, Ge, Sn; Pc = phthalocyaninato) with halogen (I2, Br2) or quinone (e.g., DDQ, TCNQ) electron acceptors produces robust, electrically conductive polymers with a wide range of stoichiometries and properties. The new materials have been studied by a variety of physical methods including X-ray diffraction, resonance Raman and infrared spectroscopy, ESR, static magnetic susceptibility, variable-temperature four-probe d.c., electrical conductivity, and voltage-shorted compaction techniques. Evidence is presented that some of the macromolecules have metal-like conductivity in the stacking direction and that transport properties within the series can be readily manipulated by rational variation of lattice architecture (e.g., the identity of the metal, M) and acceptor characteristics. Insight into those acceptor properties which stabilize the mixed valent state is provided. (Author)


Descriptors :   *POLYMERS , *ELECTRICAL CONDUCTIVITY , *ELECTRONIC STATES , *PHTHALOCYANINES , *MOLECULAR STRUCTURE , CONTROL , INFRARED SPECTROSCOPY , CRYSTAL LATTICES , RAMAN SPECTROSCOPY , X RAY DIFFRACTION , ELECTRON SPIN RESONANCE , MACROMOLECULES , MOLECULE MOLECULE INTERACTIONS , DOPING , ELECTRON ACCEPTORS , STACKING , STOICHIOMETRY , ELECTROMAGNETIC SUSCEPTIBILITY , QUINONES


Subject Categories : Plastics
      Electricity and Magnetism
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE