[Sorry if this topic already exists, I did search, couldn't find anything]
What are the most dangerous, complex, or otherwise interesting chemicals you guys have synthesized (or elements you've isolated).
Some of the scariest I've made (or isolated) include:
ClO2, Cl2I6, N2O4/5, Br, BrOx (it's been a while, forgot the oxidation state), TNT, nitrocellulose, nitroglycerin, NI3 • NH3. I have isolated sodium, and tiny amounts of potassium from reduction of their salts with Aluminum or magnesium, but never enough (and certainly not pure enough) to be worth an ampule for my element collection.
Anyway, that most of my list, interested to see what you guys have done.
[EDIT] I guess this might belong in "Citizen Chemist" as the question is directed manly at citizen chemists.