2.2. Instrumentation
A Bruker VERTEX 70 series FTIR spectrometer equipped with a
deuterated triglycine sulfate (DTGS) detector was used for this
study. Each recorded spectrum was obtained by averaging 16 scans
at a resolution of 4 cm1
.
The GC–MS instrument was used to determine TFA (Agilent
Technologies, Little Fall, NY, USA).