Abstract
1,4-bis(9-hydroxyfluoren-9-yl)benzene (H) is a versatile host compound which conforms to EdwinWeber’s host design specifications in that the molecule is rigid and bulky and contains hydroxyl moieties, which are good hydrogen-bond donors. In literature, this compound has been employed for the separation of the isomers of lutidine [1] and for the guest exchange between acetone and DMSO . The guest selectivity between aniline and benzylamine by this host has been studied and was found changed dramatically by controlling PH . In this study we investigate the inclusion properties of the host compound towards quinoline(Q), 2-methylquinoline (2MeQ), 6-methylquinoline (6MeQ) and 8-methylquinoline (8MeQ) ( see Scheme). All the guests formed inclusion compounds with the same host:guest ratio. Single x-ray crystal structures of the inclusion compounds have been elucidated and are all stabilised by (host)O-HcccN(guest) hydrogen bonds. Thermal stabilities were studied by Thermogravimetry (TG). Competition experiments were carried out to study the guest selectivity.
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