I. K. Barker, V. Fawcett, D. A. Long
Feb 1, 1987
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Influential Citations
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Journal
Journal of Raman Spectroscopy
Abstract
Resonance Raman spectra (RRS) of azobenzene, 4-aminoazobenzene, 4-methylaminobenzene and 4-dimethylaminoazobenzene in the solid state and in a range of solvents have been recorded. The RRS of the 4-aminoazobenzenes are much more solvent dependent than those of azobenzene. Their electronic absorption spectra suggest that their azo-nitrogens are strongly hydrogen bonded in aqueous media. The RRS were interpreted in terms of intra- and inter-molecular interactions. These molecules probably have a near-planar geometry in both the solid state and in aqueous media owing to intermolecular interactions. The intramolecular interactions of the nNN orbitals with the π MOs tend to cause ring twisting about the axis of the NN bond. The RRS of the aminoazobenzenes in non-polar solvents show differences from that of the powder, and these could only be attributed to the formation of non-planar structures.