Low molecular mass organogel from mesomorphic N-(4-hexyloxybenzoyl)-N '-(4 '-nitrobenzoyl)hydrazine
摘要: The mesomorphic compound N-(4-hexyloxybenzoyl)-N'-(4'-nitrobenzoyl) hydrazine (C6-NO2), containing a dihydrazide unit in the rigid core, exhibited a highly stable SmA(1) phase (between 172.2 and 259.5 degrees C) and strong gelation ability in chloroform and other non-protonic organic solvents. Both SEM observations and X-ray diffraction data indicated that the molecules self-assembled into fibrous aggregates with a diameter of about 50 nm, and retained a head-to-tail configuration within layers. FTIR and H-1 NMR studies confirmed that intermolecular hydrogen bonding played a key role in the formation of the supra-structures, and this was considered to be the driving force. Additionally, aggregation-induced enhanced emission was observed in the organogels, and this was attributed to aggregation induced planarization and J-aggregate formation.