So, lately I've been reading a lot of Hoffmann papers to practice and more about MO theory. I found an incredibly helpful article of his that he published in 1981 in Science. I think textbooks can get away with pasting this article and not giving any more explanation on the theory. It's so well written that you can start with zero knowledge in MO theory and end up understanding pretty much everything about it. The interesting thing is that although the article's title is "Theoretical Organometallic Chemistry", the famous dirhenium complex [Re2Cl8]2- complex is among some organometallic compounds. The reason?