Abstract
Indigo [1] and structurally related dye molecules e.g. indigo carmine [2] are of significant contemporary commercial and intrinsic scientific interest. In an attempt to gain a more detailed understanding of both the chemical and vibrational spectroscopic properties of the aforementioned dye molecules eleven structurally related compounds have been synthesised (examples of the synthetic molecules are shown in Fig. 1) and their SERS profiles obtained using a silver sol [3] as the SERS substrate.
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