C Br: CN -  -  + The carbon atom of the CN - ion donates a pair of electrons to the haloalkane and the C - Br breaks with loss of a bromide ion.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Chinese Academy of Sciences in Beijing, have found that dispersing copper oxide nanoparticles in a polyester lubricant, and combining this with tetrafluoroethane - a common haloalkane refrigerant known as R134a - can improve heat transfer by between 50\% and 275\%.    From Wordnik.com.  [Francis Sedgemore] Reference