What question did this study set out to answer?

This research aims to record and analyze the near-infrared Raman spectra of various indigoids and propose a vibrational assignment.

Near‐infrared fourier transform Raman spectroscopy of indigoids

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Raman spectra of indigoids reveal detailed vibrational assignments, enhancing molecular understanding.

This research aims to record and analyze the near-infrared Raman spectra of various indigoids and propose a vibrational assignment.
Recorded near-infrared Raman spectra from 3400 to 20 cm−1 using Nd:YAG laser at 1064 nm.
Conducted ab initio calculations to support vibrational assignment.
Compared spectra with previous IR and resonance Raman data.
Proposed a complete vibrational assignment for indigoids using near-infrared Raman spectroscopy.
Supported molecular structure of the indigo chromophore, highlighting a cross-conjugated vinylogue amide system.

Tatsch et al. (1995) studied this question.

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