Abstract
Valinamide ester amide of squaric acid has been synthesized and structurally characterized by single crystal X-ray diffraction. Individual molecules are linked into zig-zag helix chains running parallel to [0 1 0] by N–H ⋯ O hydrogen bonds of length 2.7908(19) A and 2.980(2) A involving the valinamide nitrogen atoms and the amide carbonyl oxygen atom. An experimental IR spectroscopic characterization and theoretical vibrational analysis have also been performed, using the possibilities of polarized linear-dichroic IR-spectroscopy (IR-LD), based on an orientation technique of the molecules as a suspension in a nematic liquid crystal.
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