Photolysis of C5H5Nb(CO)4 with excess cycloheptatriene gives the dark brown tetrahapto complex C5H5Nb(CO)2C7H8 but no C5H5NbC7H7 analogous to the corresponding reaction of C5H5V(CO)4 with cycloheptatriene. Photolysis of C5H5Nb(CO)4 with cyclooctatetraene gives the dark green tetrahapto complex C5H5Nb(CO)2C8H8, the C8H8 ring in this complex remains fluxional below 86° C. Reaction of C5H5Nb(CO)4 with I2 gives re-brown C5H5Nb(CO)3I2 in which the carbonyl groups are relatively labile. Thus reaction of C5H5Nb-(CO)3I2 with (CH3)2PCH2CH2P(CH3)2 under ambient conditions results in the rapid replacement of two CO groups to give C5H5Nb(CO)[(CH3)2PCH2CH2 -P(CH3)2]I2. Treatment of C5H5V(CO)4 with I2 at room temperature gives the carbonyl-free complex C5H5VI2 with no evidence for any cyclopentadienyl-vanadium carbonyl iodide intermediates.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry