Popeneka A. Electro- and photophysical properties of molecular semiconducting composite films with coordinated metal ions

Electro- and photophysical properties of molecular semiconducting composite films based on polymers and polycomplexes of azobenzene and heteropolynuclear Cu(II)Mn(II) complexes with coordinated metallic ions are investigated. It was shown experimentally that the investigated polymer composites have semiconducting type of conductivity, and the heteropolynuclear complexes have bipolar conductivity. Presence of coordinated metallic ions doesn't cause any significant influence on electro- and photoconductivity of the investigated polymer composites. Influence of external electric field on optical properties of polycomplexes based on azobenzene and composites with heteropolynuclear complexes was discovered for the first time. It was determined that in first case presence of cobalt ions chemically connected with the main polymer chain can cause a change of an electrooptical effect sign. The effect characteristics can be also changed by changing a polycomplex structure (a spacer length) and by adding different organic dyes to the composites structure. The electooptical effect in polymer composites with heteropolynuclear complexes is caused by changes in mutual orientation of structure blocks in the complexes. The effect in negative for the polymer composites with plane structure and it is negative for the polymer composites with framed structure. Phenomenological models qualitatively explaining obtained experimental results are suggested. For the first time a polarization hologram recording was conducted in composites based on azobenzene polycomplexes with metallic ions.