| Abstract
| - A series of mesomorphic twin-tapered bi-dihydrazine derivatives exhibited conformational transitions in the monomer state at lower concentrations (<255 μM) and self-assembled to supramolecules through intermolecular quadruple hydrogen bonding either in chloroform at higher concentrations or in bulk.
- We report on the synthesis and self-assembly of a new series of twin-tapered dihydrazide derivatives,oxalyl acid N‘,N‘-di(3,4,5-trialkoxybenzoyl)-hydrazide (FH-Tn). Results from 1H NMR diluting experimentsin chloroform and temperature-dependent 1H NMR spectroscopy revealed that molecules exhibited aconformational change at concentrations lower than 255 μM, e.g., from intramolecularly H-bonded six-membered rings to five-membered rings in the monomer state upon concentrating. Measurements of 1HNMR diluting experiment, FTIR spectroscopy, and mass spectroscopy revealed that the FH-Tn self-assembled into supramolecular chains either in chloroform at concentrations greater than 255 μM or inbulk through intermolecular quadruple H-bonding. On the basis of the results of DSC, polarized opticalmicroscopy, and wide-angle X-ray diffraction (WAXD), we assigned enantiotropic hexagonal and unknowncolumnar phases to FH-Tn (n = 6, 7, 8, 10).
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