Reactivity of a Phosphido-Niobocene Derivative toward CS2and Alkyl Halides to Give Phosphinodithioformato- and Phosphino-Niobocene Complexes: X-ray Crystal Structures of [Nb(η5-C5H4SiMe3)2(κ1-S-SC(S)(PPh2))(CO)] and [Nb(η5-C5H4SiMe3)2(P(I)Ph2)(CO)]I3 | Publicación