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The photo-induced reaction between CpNb(CO) 4  and Ph 2 P(CH 2 ) 2 PR(CH 2 ) 2 PPh 2  (L; R = Ph, Cy) yields the chelated five-membered ring complexes cis-[CpNb(CO) 2 L] (two isomers in the case of R = Cy). The uncordinated PPh2 group reacts with CpNb(CO) 3 THF to form CpNb(CO) 2 (μ-L)CpNb(CO) 3 . IR,  31 P and  93 Nb NMR spectra are discussed and compared with corresponding data of the analogous vanadium complexes.

Carbonylniobium Chemistry, IV Derivatives of η 5 -C 5 H 5 Nb(CO) 4 with Tridentate Phosphines