Although the X-ray structure of 3-carboxymethylthio-1,5-diphenylformazan (3) shows the existence of intermolecularly hydrogen bonded dimers in the solid state, physical properties of chloroform solutions indicate its existence as a monomer with a novel intramolecular hydrogen bond to a quasi-aromatic formazan ring system.
A. T. Hutton, H. M. N. H. Irving, K. R. Koch, L. R. Nassimbeni and G. Gafner, J. Chem. Soc., Chem. Commun., 1979, 57 DOI: 10.1039/C39790000057
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