Conductive conjugated systems, electronic structures

Electronic Structure of Conductive Conjugated Systems and Their Physicochemical Properties... 

The question of electronic conductivity in the polyphosphazenes inevitably raises questions regarding the electronic structure of the phosphazene linkage.7-12 This matter has been the subject of controversy in the literature, but experimentally the situation is now well known.4,13 In spite of the fact that the phosphazene backbone is fully conjugated, bond equalized and possesses bond lengths which are indicative of partial double bond character, the evidence suggests that these are localized systems. 

As the title of this article suggests, the material covered will deal with the electronic structure of conductive conjugated polymers in relation to their physicochemical properties. This subject is so broad that the theme is confined herein to polyacetylene and other conjugated systems having aromatic rings. The research in this area, however, is rapidly developing and, on reflection, yielding fruitful results that have wide applications and ramifications in quantum chemistry. 

The first reason for the enhancement effect was the formation of the more favorable structure for luminescence. The studies on the effect of different halogen anion compounds (KC1, KBr and KI) on the morin-hsDNA systems were conducted. The results showed that at the same concentrations and conditions (<1.0x10 3mol/L), KCI weakened the fluorescent intensity of the system, while both KBr and KI enhanced it, and the enhancement order was KI > KBr. It is proposed that the lone electron pair of electronegative I (or Br ), bonds to the conjugated system of morin, and that the combined system then interacted with fsDNA. With the increase of atomic radius from Br to I, the attraction between nucleus and outer electrons of... 

All electronic and electro-optic applications of poly-conjugated systems require the preparation of polymers with high chemical and structural homogeneity. Several optical and electrical properties of conjugated polymers such as their quantum efficiency of electroluminescence or maximum conductivity after doping can be correlated with the concentration of conjugation breaking defects introduced to the polymer upon its preparation. 

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