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Resonance Raman spectroscopic study of bis-azo pigments

✍ Scribed by Trevor J. Dines; Henrietta Onoh

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
424 KB
Volume
35
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

The IR, resonance Raman (RR) and electronic spectra of two bis‐azo pigments, Pigment Yellow 13 and Pigment Orange 34 were interpreted in terms of hydrogen‐bonded hydrazo structures. Assignments of the vibrational and electronic spectra were facilitated by ab initio calculations at the B3‐LYP/DZ level. A qualitative assessment of relative RR band intensities, in conjunction with band assignments, revealed the geometric changes which occur upon electronic excitation. These are in accordance with the nature of the electronic transitions predicted by time‐dependent B3‐LYP/DZ calculations. Copyright Β© 2004 John Wiley & Sons, Ltd.

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