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


Yaman G., Kayran C. , Ozkar S.

TRANSITION METAL CHEMISTRY, vol.30, no.1, pp.53-57, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1007/s11243-004-2343-5
  • Title of Journal : TRANSITION METAL CHEMISTRY
  • Page Numbers: pp.53-57

Abstract

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.