Easy formation of gold-like lustrous crystals with a high melting point from 1-aryl-2,5-bis[5-(tricyanoethenyl)-2-thienyl]pyrroles

A new class of Ti-conjugated organic compounds, 1-aryl-2,5-bis[5-(tricyanoethenyl)-2-thienyl]pyrroles that form gold-like lustrous crystals with a high molting point were obtained. The molecules in these crystals are arranged in a planar sheet to get close to each other via the intermolecular C-(HN)-N-... hydrogen bond between the cyano nitrogen and the hydrogen of the nearest thiophene or pyrrole ring, which makes the crystals sparingly soluble in common organic solvents. (C) 2003 Elsevier Science Ltd. All rights reserved.