confusedchemy

where can I find what [Ag(NH3)]2SO4, [Cu(NH3)2]2SO4, and [Ni(NH3)2]2SO4 are used in? I've read a line that they can be used in explosives, but I have not had much success in finding anything else. Ive just been doing the search on google and yahoo, is there a better place to search? Or do you know of reactions I could read on to find out? Thank you for reading, hope you can help.