Novel intramolecular hydrogen bond to a quasi-aromatic formazan ring: solution conformation and X-ray crystal structure of 3-carboxymethylthio-1,5-diphenylformazan
Abstract
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.