Four-electron reduction of dinitrogen during solution disproportionation of the organodimetallic ((eta)-C5Me4R)2Ta2((mu)-Cl)4(R = Me, Et) to a new (mu)-(eta)1,(eta)1-N2 complex and odd-electron organotrimetallic cluster

(C5Me5R)2Ta2Cl4(d^2-d^2) disproportionates under dinitrogen to [(C5Me4R)TaCl2]2((mu)-N2) and the D3h cluster cation (C5Me4R)3Ta3((mu)-Cl)6+ with anionic (C5Me4R)TaCl4-.