FTIR analysis was conducted using a Perkin Elmer Frontier FTIR spectrometer to identify any interactions occurring between molecules, such as hydrogen bonding. Diamond ATR crystal was wiped clean with ethanol, and a background scan was carried out. The sample was then placed onto the crystal. The pressure was applied at a force gauge of 70. A total of 16 scans were taken at a resolution of 2 cm−1 and using a wavelength range of 4000–600 cm−1. Two replicates were carried out for each sample.