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Photoamination of phenanthrene in the presence of p-dicyanobenzene—a flash photolysis study

✍ Scribed by K. Nieminen; J. Niiranen; H. Lemmetyinen; Irina Sychtchikova

Book ID
103993615
Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
676 KB
Volume
61
Category
Article
ISSN
1010-6030

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✦ Synopsis

The photoamination of phenanthrene (PhH) with ethylenediamine (EDA) in the presence ofp-dicyanobenzene (DCB) was studied in a 9:l acetonitrile-water mixture using a nanosecond excimer laser flash photolysis system. Time-resolved transient absorption spectra and decay curves at different absorption wavelengths were analysed. Five different transients, 3PhH*, PhH", DCB'-, [PhH* . . .DCB-] and [PhH+-EDA], were observed. The efficiency of the photoamination depends on two important steps. The first is an electron transfer via an exciplex-type transient between PhH and DCB and the subsequent formation of an ion. pair. The second step is a nucleophilic attack by the amine on the ion pair. This reaction competes with the dissociation of the ion pair.

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