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Pentacarbonyl(2-ferrocenylpyridine)metal(0) complexes of Group 6 elements. Synthesis and characterization

Yaman, G
Kayran, C
Özkar, Saim
2-Ferrocenylpyridine (2-Fcpy) was prepared according to the literature procedure. 1,1'-Dipyridylferrocene was also obtained as a minor product and characterized by H-1- and C-13-n.m.r. spectroscopy. Prolonged irradiation of Cr(CO)(6) in the presence of 2-Fcpy in n-hexane gave Cr(CO)(5)(2-Fcpy) which could not be isolated due to its instability even at low temperature, but was detected in solution by i.r. spectroscopy. The preparation of Mo(CO)(5)(2-Fcpy) from direct photolysis of Mo(CO)(6) with 2-Fcpy could not be achieved. However, the reaction of Mo(CO)(5)( THF) with 2-Fcpy gave Mo(CO)(5)(2-Fcpy) which was isolated and characterized by i.r., H-1- and C-13-n. m.r. spectroscopic techniques. W(CO)(5)(2-Fcpy) was prepared by irradiation of W(CO)(6) in the presence of 2-Fcpy in n-hexane. The complex was isolated and characterized by i. r., H-1-, C-13-n. m. r. spectroscopic techniques. W(CO)(5)(2-Fcpy) thus appears to be more stable than the Mo and Cr analogues. The main reason for the general instability of the M(CO)(5)(2-Fcpy) complexes is assigned to the weak pi-accepting ability of 2-ferrocenylpyridine.