Studies on UV/Vis Absorption Spectra of Azo Dyes. XVII. A Modified Increment System for the Calculation of the Absorption Maxima of Polysubstituted Azobenzenes

Mustroph, Heinz

doi:10.1002/prac.19873290124

J. Prakt. Chem.

1987

DOI: 10.1002/prac.19873290124

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Studies on UV/Vis Absorption Spectra of Azo Dyes. XVII. A Modified Increment System for the Calculation of the Absorption Maxima of Polysubstituted Azobenzenes

Heinz Mustroph

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Cited by 3 publications

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Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Lewandowsky

Mayer

Marx³

et al. 1992

Angew. Makromol. Chem.

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Starting from 10 different 4'-substituted 4-[N,N-dihydroxyethyl]aminoazobenzenes,polymeric urethane-azo dyes (M, 42000-10200) were prepared by reacting those with hexamethylene diisocyanate. The dependence of spectral properties, redox potentials and photofading behaviour on the kind of substituents was determined and then compared with corresponding monomer and dimer model compounds. Photofading is caused by a photooxidative process. In the sequence of monomeric > dimeric > polymeric azo dyes, light stability decreases due to a diminution in thermal desactivation processes and in a possible intramolecular energy transfer. ZUSAMMENFASSUNG:Ausgehend von 10 unterschiedlich 4'-substituierten 4-[N,N-dihydroxyethyl]aminoazobenzolen wurden durch Umsetzung mit Hexamethylendiisocyanat polymere Azofarbstoffe (M,, 4200-10200) synthetisiert und die Substituentenabhangigkeit der spektralen Eigenschaften, der Redoxpotentiale und des Ausbleichverhaltens mit entsprechenden monomeren und dimeren Modellverbindungen verglichen. Die Ausbleichung erfolgt durch einen photooxidativen ProzeB. In der Reihenfolge monomerer > dimerer > polymerer Azofarbstoff sinkt die Lichtstabilitat durch die Verringerung thermischer Desaktivierungsprozesse sowie durch einen mdglichen intramolekularen Energietransfer.

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Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Lewandowsky

Mayer

Marx³

et al. 1992

Angew. Makromol. Chem.

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Untersuchungen zum UV/Vis‐Spektralverhalten von Azofarbstoffen. XVIII. Substituenteneinflüsse auf die Absorptionsmaxima der n → π^– und π → π^‐Banden von 4‐N,N‐Diethylaminoazobenzenen

Hassner

Mustroph

1987

J. Prakt. Chem.

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Studies on UV/Vis Absorption Spectra of Azo Dyes. XVIII. Substituent Effects on the Absorption Maxima of the n → π* and π → π* Bands of 4‐N,N‐Diethylaminoazobenzenes The spectra of 27 substituted 4‐N.N‐diethylaminoazobenzenes are determined. The band systems can be separated by deconvolution into two Gaussian curves. The results so obtained show that the effects of substituents on n → π* and π → π* transitions are similar and that electron withdrawing substituents in the phenylazo residue cause a bathochromic shift of both the n → π* and the π → π* bands.

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Synthesis of dye functionalized xerogels via nucleophilic aromatic substitution of fluoro aromatic compounds with aminosilanes

Seifert

Ladewig

Schönherr

et al. 2009

J Sol-Gel Sci Technol

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Studies on UV/Vis Absorption Spectra of Azo Dyes. XVII. A Modified Increment System for the Calculation of the Absorption Maxima of Polysubstituted Azobenzenes

Cited by 3 publications

References 17 publications

Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Untersuchungen zum UV/Vis‐Spektralverhalten von Azofarbstoffen. XVIII. Substituenteneinflüsse auf die Absorptionsmaxima der n → π^– und π → π^‐Banden von 4‐N,N‐Diethylaminoazobenzenen

Synthesis of dye functionalized xerogels via nucleophilic aromatic substitution of fluoro aromatic compounds with aminosilanes

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Studies on UV/Vis Absorption Spectra of Azo Dyes. XVII. A Modified Increment System for the Calculation of the Absorption Maxima of Polysubstituted Azobenzenes

Cited by 3 publications

References 17 publications

Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane‐azo dyes

Untersuchungen zum UV/Vis‐Spektralverhalten von Azofarbstoffen. XVIII. Substituenteneinflüsse auf die Absorptionsmaxima der n → π*– und π → π*‐Banden von 4‐N,N‐Diethylaminoazobenzenen

Synthesis of dye functionalized xerogels via nucleophilic aromatic substitution of fluoro aromatic compounds with aminosilanes

Contact Info

Product

Resources

About

Untersuchungen zum UV/Vis‐Spektralverhalten von Azofarbstoffen. XVIII. Substituenteneinflüsse auf die Absorptionsmaxima der n → π^– und π → π^‐Banden von 4‐N,N‐Diethylaminoazobenzenen