[mcrdotcom]

Obviously octahedral is by far the most likely answer to any question asked about CN6 complexes, but how would you tell if it was trigonal prismatic?

My notes say that [Zr(Me)₆]^2- is trig. pris. and I'm answering an exam question asking for [Ni(CN)₆]^3- geometry and to explain in a few words... As it asks to explain, I kinda wonder if its an unusual answer, can't see why octahedral would need explaining...

Anyway just wondering if there are any rule of thumbs for this