properties of single-chain ammoniumamphiphiles containing benzylideneaniline and salicylideneaniline units as rigid segments in the formation of aqueous bilayers, cast multi-bilayers, and surface monolayers were studied. Electron microscopy indicated that aggregate morphologies observed in water, such as vesicles and fibers, were dependent on the nature of the aromatic unit and the alkyl-chain length
Optically biaxial interdigitated smectic A phase: liquid crystalline dimeric bidentate ligands and their metal complexes
作者:Channabasaveshwar V. Yelamaggad、Indudhara Swamy Shashikala、V. Padmini Tamilenthi、D. S. Shankar Rao、Geetha G. Nair、Subbarao Krishna Prasad
DOI:10.1039/b717123d
日期:——
A detailed study into the synthesis and characterization of achiral nonsymmetric dimeric bidentate ligands formed by combining salicylaldimine and cyanobiphenyl rodlike anisometric segments through a flexible spacer (varying in its length and parity) and their Cu(II) and Pd(II) complexes is reported. The spacer parity greatly influences the phase behavior of ligands; notably, the dimers with odd-parity spacer stabilize nematic, uniaxial smectic A and biaxial smetic A phases, while the even-members display nematic and / or smectic phase/s. Unlike ligands, both the metal complexes solely show nematic behavior. An odd–even effect, as noted for ligands, was observed for the nematic–isotropic transition temperatures and the associated entropy values of copper complexes, while such behavior was not found in the case of palladium complexes.
The biaxial smectic (SmAb) phase in nonsymmetric liquid crystal dimers comprising two rodlike anisometric segments: an unusual behavior
作者:Channabasaveshwar V. Yelamaggad、Indudhara Swamy Shashikala、Doddamane S. Shankar Rao、Geetha G. Nair、Subbarao Krishna Prasad
DOI:10.1039/b612132b
日期:——
The first nonsymmetric liquid crystal dimers, possessing salicylaldimine and cyanobiphenyl rodlike anisometric segments, exhibiting the biaxial smectic A (McMillan) phase unequivocally evidenced by microscopic, conoscopic, calorimetric and X-ray diffraction studies is reported.
A novel supramolecular polymer gel constructed by crosslinking pillar[5]arene-based supramolecular polymers through metal–ligand interactions
作者:Pi Wang、Hao Xing、Danyu Xia、Xiaofan Ji
DOI:10.1039/c5cc07252b
日期:——
A novel heteroditopic A-B monomer is synthesized and used to construct linear supramolecular polymers utilizing pillar[5]arene-based hostguest interactions. Specifically, upon addition of Cu2+ ion, the supramolecular polymer chains are crosslinked...