Reaction products of benzimidazole with tetracyanoethylene. Mechanism of formation and 13C NMR spectroscopy of the anions C16N8H5–, dicyano(3,4-dicyano-5-benzimidazol-1-yl-2H-pyrrol-2-ylideneamino)methanide (1) and C18N9H4–, 1,2,4,5-tetracyano-3,6,7,12,13-penta-aza-5H-indeno[1,2-d]-acenaphthylen-5-ide (2). Crystal and molecular structure of their tetraphenylarsonium salts

Abstract

The anions (1) and (2) have been synthesized by the reaction of benzimidazole with tetracyano-ethylene. They have been characterized by X-ray crystallography and ¹³C NMR spectroscopy. The molecular structures of their tetraphenylarsonium salts have been determined. The charge delocalization and mechanism of formation are discussed.