The FTIR spectra were recorded on a Nicolet 8700 FTIR spectrometer (Thermo Fisher Scientific Inc., USA). The spectra were acquired by using the attenuated total reflection (ATR) technique in the wavenumber range of 4000 to 600 cm1 with scan times of 32 at 8 cm1 resolution.
The FTIR spectra were recorded on a Nicolet 8700 FTIR spectrometer(Thermo Fisher Scientific Inc., USA). The spectra wereacquired by using the attenuated total reflection (ATR) technique inthe wavenumber range of 4000 to 600 cm1 with scan times of 32at 8 cm1 resolution.