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