Question

your compound is a liquid and you would like to obtain an IR spectrum. What options for running this sample do you have ? In each case indicate the reference you must remove so the spectrum is only that of your sample.

Answer 1

There are two options for getting IR spectrum of a liquid sample,

1) Samples can be dissolved in an appropriate solvent to give a solution. A drop of this solution is placed on a NaCl plate or by using a sodium chloride solution cell. Solvents should be free of water to avoid damaging the sodium chloride cell surfaces.

After that spectrum of the blank solvent should be obtained as a reference and it is subtracted from the sample spectrum.

2) A drop of the liquid is squeezed between two sodium chloride (NaCl) plates, which are transparent in the 4000-625 cm^-1 region.The plates are then placed in a holder and a spectrum is taken. If the peaks in the spectrum are too intense the liquid can be wiped from one plate, then the spectrum taken again.