Hemical and spectral sensitization of the photoconductivity and the photo‐E.M.F. In polymeric acetylenides

Abstract

SYNOPSISThe marked change of the conductivity, the photoconductivity and the photo-e.m.f. is revealed when the poly-copperphenyl acetylenide (PAC) is treated by DNA, RNA and adenine. The spectral characteristics of the photoeffect, the sign of the charge carrier and kinetics of the photoconductivity are studied. The data obtained is explained by the creation of the new recombination centers after treatment of the PAC. The treatment of the polymer by amino acids leads to creating the complex copper (11) compounds and aminoacid residue. It is shown that the inner photoeffect in PAC can be spectrally sensitized up t o the near infra-red region after the dye adsorption on the polymer surface. The energy transfer mechanism is preferred for the explanation of the I.R. sensitization.Since 1960 we have been studying the inner photoeffect in organic polymers.'-6 Here we consider the alteration of the photosemiconductive properties of the poly-copper-phenyl-acetylenide (PAC) when the latter interacts with different agents.The paper consists of two parts. The influence of the nucleic acids (DNA and RNA), purine and pyrimidine bases and aminoacids on the semiconductive properties of the PAC is considered in the first section. This part of the study was initiated by the widespread ideas of semiconductor physics for investigation of the biopolymers and polypeptides 7-9 and nucleic acids.' O-' This proceeded from the notion about the important role of the charge transfer for oxidation processes in living organisms.' The analysis of the interaction of the synthetic polymers with biopolymers leads us, it seems, to the perspective of clearing the specific properties of the biological substances. The absence of the new bands in the photoconductivity spectra of the PAC, after its treatment with biopolymers, permits us t o consider the revealed phenomena as chemical sensitization of the photoeffect. The second part of the paper is related to the investigation of the spectral sensitization of PAC by adsorbed organic dyes. The effect of the spectral sensitization of the photoeffect in organic polymers for the visual range 0 1970 by John Wiley & Sons, Inc.

Some experimental results on polyN-vinylcarbazole–buckminsterfullerene (C60) nanocomposite system

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Electrolyte and solvent effects of electrocoated polycarbazole thin films on carbon fiber microelectrodes

“…Secondly, carbazole derivatives are good electron donors [19], which means they can be used in studies of photo-induced energy transfer and electron transfer to electron acceptors. The last property makes carbazole-containing polymers attractive in regards to many electronic applications and photo electronic applications [20][21][22].…”

Organometallic modification approach to the control of push–pull architectures: Synthesis, properties and radical polymerization of chromium N-vinylcarbazole derivatives

“…On the other hand, the chromium atom might be tuned to act as an intermediary between donor and acceptor moieties by replacing a CO group with other ligands, for example, PPh 3 and ðC 3 H 5 Þ þ BF À 4 ligands are efficient at either donating or accepting electrons relative to CO [8]. In the present paper, we give full details of the syntheses of the (N-vinylcarbazole)bisCr(CO) 3 (3) and (N-vinylcarbazole)-Cr(CO) 2 L, where L = CO (2), PPh 3 (4) and ðC 3 H 5 Þ þ BF À 4 (5) (Scheme 1). The structural features of such complexes with various ligands are discussed in relation to their behavior in photophysics and radical polymerization.…”

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