Kash wrote: nitrogen dioxide is toxic gas
try "deadly".
back in my more adventurous days, I would distill tech grade nitric acid over conc. sulfuric, to give red fuming nitric acid. among the red fumes was NO2; I did this with open ventilation, of course.
there's no good reason to gas a nonpolar solvent with nitrous either. it won't form any salt complexes.
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck