Title
Helicity Control of Supramolecular Gel Fiber Consisting of Achiral Ni(II) Complex in Chiral Nematic Solvent
Author
Takatoshi Maeda, Yuuki Kuwajima, Takuya Akita, Yosuke Iwai, Naruyoshi Komiya, Yoshiaki Uchida, Takeshi Naota
Year
2018
Journal
Chemistry A European Journal
Abstract
The supramolecular chirality of aggregates consisting of achiral trans‐bis(salicylaldiminato)Ni(II) complex 1 bearing long alkyl chains can be generated and controlled precisely in chiral nematic liquid crystalline (LC) solvent, while the complex naturally forms achiral gel fibers in achiral nematic LC solvents and crystals in non‐mesogenic solvents. Direction and intensity in the helicity of the gel fibers of 1 in the LC gel state can be adjusted according to the helical twisting nature and concentration of the chiral dopants. Helicity control was precisely detected from the circular dichroism (CD) spectra of LC‐gels, and direct scanning electron microscopy (SEM) observation of the dried gel fibers. XRD analysis revealed that the flexibility of the herringbone‐based lamellar alignment of this complex is a key for the LC‐specific gelation and helicity control of the gel fibers.
Instrument
J-820
Keywords
Circular dichroism, Stereochemistry, Cotton effect, Chemical stability, Thermal stabilitiy, Materials