Control the self-assembly of fluorenone-based polycatenars by tuning chain length

Concentration-Dependent Conformational Isomerization of Fluorenone-Based Polycatenar in 2D Polymorphic Self-Assembly

“…Likewise, some literatures reported that rod molecules preferred to form the antiparallel arrangement in the LC systems, driven by the lateral hydrogen bonds and dipole− dipole interactions. 36,48 However, the spinning of the rod molecule would be suppressed by the strong lateral intermolecular hydrogen bonding, which further led to the destabilization of the mesophase. From above results, it can be deduced that the double-S nanostructure constructed by dimer-S is more reasonable for the arrangement of rod-like cores in the LC state because of its higher binding energy and weaker hydrogen bonds.…”

“…Both liquid crystalline and gel properties were investigated. 36 However, the self-assembled behavior of such molecule has not been reported up until now. Considering the impotance of fluorenone and thiophene groups in optoelectronic materials, 37−39 herein we synthesized a fluorenonebased polycatenar with 2,7-bis((5-phenylthiophen-2-yl)ethynyl)-9-fluorenone and −OCH 2 − linked terminal benzene groups (FTQ).…”

“…Recently, longer rod-like molecules with a central 2,7-diphenyl-9-fluorenone core and a −COO– linked 3,4,5-trialkoxy­benzoate unit at each side (FC/ n ) have been synthesized. Both liquid crystalline and gel properties were investigated . However, the self-assembled behavior of such molecule has not been reported up until now.…”

Terminal Group Effect on Two-Dimensional Self-Assembly of Fluorenone-Based Liquid Crystals at the Solid/Liquid Interface

“…The fluorenone unit, characterized by its large π-conjugated planar aromatic configuration, serves as a versatile electron-deficient building block extensively used in organic optoelectronics such as organic light-emitting devices (OLEDs), OFFETs, and organic photovoltaics. − Due to its inherent polarity and the hydrogen-bonding site of −CO group, fluorenone derivatives exhibiting liquid crystal (LC) or gel property have received much attention in recent years. − Integrating the ordered structures within LCs and the luminescent attribute of fluorenones, fluorenone-based LCs could be utilized in semiconductors with efficient optoelectronic and modulable self-organization properties. − Thus, exploring fluorenone-based LCs with complex two-dimensional (2D) or three-dimensional (3D) mesomorphic structures is necessary. In common, the liquid crystalline properties are characterized through techniques such as differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD).…”

“…In previous work, the self-assembled behavior of fluorenone-based molecules on the HOPG surface is profoundly influenced by the molecular side-chain length, solvent, and solution concentration. − The molecular packing patterns were associated with intermolecular dipole–dipole interactions and −CO···H hydrogen-bonding interactions . Recently, longer rodlike molecules with LC and gel properties have been synthesized, featuring a central 2,7-diphenyl-9-fluorenone core alongside −COO– and −OCH 2 – linked 3,4,5-trialkoxybenzoate unit at each side . The chain length effect in the 3D solid states and organogels was investigated.…”