Structural features of the photogeneration mechanism of free charge carriers in element-containing polydisalicylidene azomethine series

Photophysical properties of new polytetra- and polydisalicylidene azomethines (PSAMs) with chains containing Si, Ge, Sn, or transition metal atoms and atoms of a number of other divalent metals are studied. Based on data on ultraviolet and infrared spectra, it was found that the noncovalent transann...

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Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2010-05, Vol.44 (5), p.634-641
Main Authors: Aleksandrova, E. L., Ivanov, A. G., Geller, N. M., Shamanin, V. V.
Format: Article
Language:English
Subjects:
Amorphous
ATOMS
CARRIERS
CHARGE CARRIERS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON PAIRS
ELEMENTS
INTERACTIONS
Magnetic Materials
Magnetism
MATERIALS SCIENCE
METALS
Microcrystalline Semiconductors
Semiconductor Composites
Organic
PHOTOSENSITIVITY
Physics
Physics and Astronomy
POLYMERS
Porous
Schiff bases
SEMIMETALS
SENSITIVITY
TRANSITION ELEMENTS
Transition metal compounds
Vitreous
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Summary:Photophysical properties of new polytetra- and polydisalicylidene azomethines (PSAMs) with chains containing Si, Ge, Sn, or transition metal atoms and atoms of a number of other divalent metals are studied. Based on data on ultraviolet and infrared spectra, it was found that the noncovalent transannular donor-acceptor interaction N M (M is semimetal or metal) occurs in polymers, which leads to the formation of a polymer chain of six-membered cycles. As a result, polyconjugations arise in PSAMs by a “non-classical” mechanism. Due to multiple donor-acceptor interactions of unshared electron pairs of azomethine groups with vacant d -orbitals in metals, polymers feature conductive, photosensitive, and photoconductive properties. The photosensitivity and quantum yield of photogeneration of free charge carriers for PSAMs are close to the values characteristic of classical conducting polymers. It was shown that the PSAM properties are controlled by the azomethine fragment structure and acceptor properties of metal. A mechanism of free carrier photogeneration was suggested.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782610050155