Electronic spectra of 4-amino-benzonitrile (ABN) single crystal


J. Bosson-Ehooman1*, P. L. Baldeck2, M. Pierre2

1 UFR Sciences Fondamentales et Appliquées,Université Abobo-Adjamé,

02 BP 801 Abidjan 02 Rép. Côte d'Ivoire

2 Laboratoire de Spectrométrie Physique, CNRS UMR5588, 

Université Joseph Fourier - Grenoble I B.P.87, 38402 Saint-Martin-d'Hères Cedex, France

* Corresponding author. E-mail: mamaketci@yahoo.fr

Received: 06 April 2006; revised version accepted:05 April 2007



     Reflection spectroscopy and Kramers-Kronig analysis are used to characterize the main transitions in 4-amino-benzonitrile (ABN) single crystals. The strong Internal Charge Transfer (ict) transition is identified at 278 nm. The broad low temperature spectrum and the large red-shift by comparison to the vapour suggest specific interactions of the ict excited molecule involving hydrogen bonds with the surrounding. A sharp and structured absorption peaking on the lower energy onset of the ict transition is assigned to a singlet p-p* transition with a short axis polarized 0-0 line at 311 nm.


Keywords: Internal Charge Transfer; Aminobenzonitrile; Reflection spectroscopy; Absorption spectroscopy.

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