Crystalline inclusion compounds of new elongated bisfluorenol hosts with protic guest molecules

Abstract

Two new crystalline host compounds of bisfluorenol type featuring an elongated core structure compared to a known parent molecule (2,2′′-[1,1′:4′,1′′]-terphenylyl versus 2,2′-biphenylyl) have been synthesized. Crystalline inclusion compounds involving protic guest molecules have been prepared and studied with reference to their crystal structures. Conformational changes as against the prototype compound due to prevention of the intramolecular hydrogen bond between the hydroxy groups give rise to a specific mode of host–guest association, showing preference to the formation of infinite hydrogen bonded chains instead of discrete host–guest units. Potentiality for crystal engineering using respective two-component molecular systems is indicated.