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Dyes of the triphenylmethane type as sensor materials for solvent vapours

Dyes of the triphenylmethane type as sensor materials for solvent vapours 216 333 333 6 6 Franz L. Dickert Michael Vonend Heinz Kimmel Gert Mages Institute of Physical and Theoretical Chemistry Erlangen University Egerlandstrasse 3 D-8520 Erlangen Federal Republic of Germany Siemens AG, Central Research and Development ZFE AMF 3 Paul-Gossen-Strasse 100 D-8520 Erlangen Federal Republic of Germany Summary The formation of highly coloured trityl ions from substituted phthalides can be utilized for the detection of solvent vapours in the air down to nearly ten ppm. These optochemical sensor materials were optimized with respect to their sensitivity, stability, linearity of the response and exclusion of the humidity influence. For this purpose the 4,4′,4″-substituents at the aromatic rings of the dyes must yield an appropriate carbenium ion stability. Thus even small amounts of absorbed solvent vapours lead to the reduction of the dye concentration in the sensor layers. The largest sensitivity can be achieved by applying dyes with two — N(CH 3 ) 2 substituents or, instead of one dimethylamino group, the — OCH 3 group at the aryl rings. Further improvements to reduce the sensor response to moisture were possible by introducing into the phthalides large aromatic ring systems with a hydrophobic behaviour such as indolyl. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Analytical and Bioanalytical Chemistry Springer Journals

Dyes of the triphenylmethane type as sensor materials for solvent vapours

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References (4)

Publisher
Springer Journals
Copyright
Copyright © 1989 by Springer-Verlag
Subject
Chemistry; Analytical Chemistry; Food Science; Inorganic Chemistry; Physical Chemistry; Monitoring/Environmental Analysis/Environmental Ecotoxicology
ISSN
1618-2642
eISSN
1618-2650
DOI
10.1007/BF00496932
Publisher site
See Article on Publisher Site

Abstract

216 333 333 6 6 Franz L. Dickert Michael Vonend Heinz Kimmel Gert Mages Institute of Physical and Theoretical Chemistry Erlangen University Egerlandstrasse 3 D-8520 Erlangen Federal Republic of Germany Siemens AG, Central Research and Development ZFE AMF 3 Paul-Gossen-Strasse 100 D-8520 Erlangen Federal Republic of Germany Summary The formation of highly coloured trityl ions from substituted phthalides can be utilized for the detection of solvent vapours in the air down to nearly ten ppm. These optochemical sensor materials were optimized with respect to their sensitivity, stability, linearity of the response and exclusion of the humidity influence. For this purpose the 4,4′,4″-substituents at the aromatic rings of the dyes must yield an appropriate carbenium ion stability. Thus even small amounts of absorbed solvent vapours lead to the reduction of the dye concentration in the sensor layers. The largest sensitivity can be achieved by applying dyes with two — N(CH 3 ) 2 substituents or, instead of one dimethylamino group, the — OCH 3 group at the aryl rings. Further improvements to reduce the sensor response to moisture were possible by introducing into the phthalides large aromatic ring systems with a hydrophobic behaviour such as indolyl.

Journal

Analytical and Bioanalytical Chemistry – Springer Journals

Published: Jan 1, 1989

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