Exchange Coupling in Niobocene Trihydrides, Nb(C5H3RR‘)2H3, and Their Adducts with Copper Triad Cations, [Nb(C5H3RR‘)2H32M]+ (R = R‘ = H; R = H, R‘= SiMe3; R = R‘ = SiMe3; M = Cu, Ag, Au) | Publicación