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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Molecular engineering 1 (1992), S. 295-303 
    ISSN: 1572-8951
    Schlagwort(e): Polyimide systems ; electric conduction ; electronic structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The electronic structures of newly designed polyimide systems (ethenetetracarboxylic 1,2:1′,2′-dianhydride-diaminoethyne (PI-A) and ethenetetracarboxylic 1,1′:2,2′-dianhydride-diaminoethyne(PI-B)) are studied in detail with respect to their optimized geometries on the basis of the one-dimensional tight-binding self-consistent field crystal-orbital method. The computational results have revealed that PI-B shows intriguing properties such as a very small band gap and a wide bandwidth near the frontier level, compared with PI-A and other polyimides. Since PI-B would be a promising candidate for a new electric conducting material, a reaction diagram for this polymer is also proposed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 14 (1985), S. 45-54 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Necessary conditions for polymers to manifest metallic properties are studied focusing on their primary structures from quantum chemical points of view. A couple of novel polymers, which will show metallic properties, are designed taking these conditions into consideration.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 63 (1997), S. 637-644 
    ISSN: 0020-7608
    Schlagwort(e): Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We have examined the bond-alternation patterns of the energetically optimized structures of single-layer carbon nanotubes predicted to be “metallic” by the earlier Hückel-type treatment in order to check the possibility of Peierls distortion. A semiempirical one-dimensional tight-binding crystal orbital (1D-TBCO) method including all the valence electrons was employed in the calculation. It was found that a certain bond alternation appears in the “metallic” tubes but that such alternation does not necessarily cause a breakdown of the metallic band structure. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 63 (1997), S. 361-366 
    ISSN: 0020-7608
    Schlagwort(e): Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Mixing of triply degenerated lowest unoccupied molecular orbitals (LUMO; t1u) and the next LUMO (NLUMO; t1g) of a neutral C60 molecule was estimated when it becomes dianionic (C602-) and trianionic (C603-) species. The electronic structure of the basic C60 was obtained by a semiempirical (INDO type) Hartree-Fock scheme and the mixing of the t1u and t1g MOs by the conventional configuration interaction (CI) method assuming Ih structural symmetry of a C60 for the sake of simplicity. The most favorable electronic states of C602- and C603- are predicted to be triplet and doublet, respectively. Furthermore, in C602-, the energy difference of this triplet state and the first excited singlet state is very close, which agrees well with the experimental observation. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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