Dependence on the Substituents of the Photoconduction from Arylamines Aromatic amines are often used as charge transporting agents in electrophotographic two-layer-systems. Structure-property-relations of this substance class are discussed on the basis of homogeneously sensitized polycarbonat-layers containing derivatives of anilines. Substituent variation of the actinic compounds has a significant influence on the electrophotographic sensitivity. Correlations between Hammett substituents constants and electrophotographic sensitivity are useful for the preselection of arylamin structures. Dibenzylamino groups lie out of these correlations and induce an unexpected high photoconductivity. This fact was investigated by cyclovoltammetric measurements of 22 various dibenzylanilines. Low half-peakpotentials and reversible one-electron oxidation steps of dibenzylanilines are necessary for outstanding photoconductor properties.

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Starting from analyses of the patent situation, trends and important material types of subject monomeric organic photoconductors are recorded. An introduction to N-benzhydrylanilines and important possibilities of synthesis are given. 23 compounds are described in this paper. Structure-properties relations and correlations between the electrophotographic sensitivity and the Hammett-constants of the substituents are discussed.

Journal für Praktische Chemie/Chemiker-ZeitungVolume 334, Issue 5 p. 437-440 Arbeitsvorschriften Und MeßWerte Synthese, Charakterisierung und UV-VIS-spektroskopisches Verhalten von 4-benzhydrylamino-substituierten Azobenzolen Synthesis, Characterization and UV-VIS-spectral Behaviour of 4-Benzhydrylamino-substituted Azobenzenes Prof. Dr. J. Epperlein, Corresponding Author Prof. Dr. J. Epperlein Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandFachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this authorS. Mais, S. Mais Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this authorB. Blau, B. Blau Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this author Prof. Dr. J. Epperlein, Corresponding Author Prof. Dr. J. Epperlein Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandFachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this authorS. Mais, S. Mais Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this authorB. Blau, B. Blau Fachbereich Chemie der Technischen Universität Chemnitz, Straße der Nationen 62 O-9010 Chemnitz, Bundesrepublik DeutschlandSearch for more papers by this author First published: 1992 https://doi.org/10.1002/prac.19923340513Citations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume334, Issue51992Pages 437-440 RelatedInformation

The formal kinetics of dark decay of surface potential was investigated on various layers of organic photoconductors. Several functions known from literature were compared with the equation U(t) = U0(1 + t/tau)-a being in good agreement with the experimental results. An interpretation is proposed for parameters tau and a.

ChemInformVolume 20, Issue 45 Physical Organic Chemistry ChemInform Abstract: UV-VIS Behavior of 4-(n-Alkylamino)-azobenzenes J. EPPERLEIN, J. EPPERLEIN Sekt. Chem. Werkstofftech., TU Karl-Marx-Stadt, DDR-9010 Karl-Marx-StadtSearch for more papers by this authorB. BLAU, B. BLAU Sekt. Chem. Werkstofftech., TU Karl-Marx-Stadt, DDR-9010 Karl-Marx-StadtSearch for more papers by this author J. EPPERLEIN, J. EPPERLEIN Sekt. Chem. Werkstofftech., TU Karl-Marx-Stadt, DDR-9010 Karl-Marx-StadtSearch for more papers by this authorB. BLAU, B. BLAU Sekt. Chem. Werkstofftech., TU Karl-Marx-Stadt, DDR-9010 Karl-Marx-StadtSearch for more papers by this author First published: November 7, 1989 https://doi.org/10.1002/chin.198945036Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume20, Issue45November 7, 1989 RelatedInformation

Investigations Concerning Sensitization of Silver Free Information Recording Materials with Azo Dyes and Polyhalogen Compounds Recording materials mentioned in the title are sensitive to the visible region of light. The reason therefore is an energy transfer from the azo dye to the polyhalogen compounds, preferentially CBr 4 . It's possible to separate the absorption spectra of azo compounds used in this work into two gaussian functions, which relates to n,π*- and π,π*-transitions. Only the excitation of the n,π*-transition causes sensitization. A mechanisms of sensitization is proposed.

Picosecond Spectroscopic Investigations of 1‐Phenylazo‐2‐naphtholsThe photoisomerization of substituted 1‐phenylazo‐2‐naphthols is studied in fluid solution and in polymer film (cellulose acetate). With the help of picosecond spectroscopy the absorption from an excited state, bleaching, and time resolved fluorescence were measured. The results can be interpreted by the assumption that during periods of less than 10 ps, the S1‐state of the azo form is changed to the S1‐state of the hydrazone form by proton transfer. This S1‐state relaxes by internal conversion and by diabatic isomerization with a time constant of 20 to 60 ps, depending on substituent and solvent. By exciting the substances solved in polymer film, we observed a relatively strong fluorescence, which is found to be amplified spontaneous emission (superfluorescence).

Nitrogen‐15 and Carbon‐13 Chemical Shifts and 13C‐1H, 13C‐15N and 15N‐15N Coupling Constants of Parasubstituted Arene Diazonium SaltsNitrogen‐15 and carbon‐13 chemical shifts and 13C‐1H,13C‐15N and 15N‐15N coupling constants of 15N‐enriched p‐substituted arene diazonium salts are reported and within the ΔE‐approximation investigated. It is shown that changes of ΔE should be taken into account when considering variation of the nitrogen‐15 chemical shifts. The influence of substituent effects was discussed within the DSP (dual substituent parameter)‐approach.

Flash Spectroscopic Investigations on 1‐Phenylazo‐2‐Naphthols 1‐(p‐R‐Phenylazo)‐2‐naphthols with R = NMe 2 , OH, OCH 3 , CH 3 , H, F, Br, COCH 2 , NO 2 , CN show reversible bleaching over the entire visible and near u.v. spectral region upon flash photolysis in ethanol and toluene. It is proposed to interpret this by photochemical formation of the corresponding cis‐azo compound. The thermal relaxation is not an elementary reaction but it involves intermediate tautomerisation. A V‐shaped Hammett correlation is found for the rate constants of the thermal relaxation.

Light Absorption and Substituent Effects of Stibene‐4‐diazonium Ions Substituent effects on ṽ max ‐values of 31 stilbene‐4‐diazonium ions are studied. With increasing donor strength of a substituent in 4′‐position the long wave absorption band of stibene‐4‐diazonium ions shifts from the ultraviolet to the red region of the spectrum. The particular deep colour of diazonium compounds may be described by the very high σ p ‐Hammett‐constant of the diazonium group. The substituent effects found characterize stilbene diazonium ions as typical donor‐acceptor chromogenes.