Question

please help !!!
You are given an organic solid which reacts with most organic solvents. How would you obtain the IR spectrum of it?

Answer 1

Mix the organic compound with KBr and make a KBr pellet. Run the IR spectrum.

Answer 2

Thank you for your answer. Why we do not use mull or thin-solid film method for this one?

Answer 3

I thought of a mull first but since mulls are liquids (nujol mull for example) my guess is it will be soluble in that also although we don't normally think of nujol as a solvent. As for thin films, I don't know how you get a thin film of a solid (powder) although if it were crystalline enough, like NaCl, one might be able to slice off a think film. Many organic compounds don't have that kind of crystal structure. I have always made thin films by dissolving in a solvent and letting a thin film form by evaporation; however, the problem precludes that. Therefore, the KBr pellet is the safest answer, I think, given the parameters.