Synthesis and characterization of a series of sila-bridged diiron complexes (E)[(η5-t-BuC5H3)Fe(CO)]2(μ-CO)2 (E=Me2Si, Me2SiSiMe2, Me2SiOSiMe2). The molecular structures of cis- and trans-(Me2Si)[η5-t-BuC5H3)Fe(CO)]2(μ-CO)2
摘要:
Binuclear iron complexes (E)[(eta(5)-t-BuC5H3)Fe(CO)](2)(mu-CO)(2) [E = Me2Si (1), Me2SiOSiMe2(3)] were prepared by reaction of Fe(CO)(5) with the corresponding cyclopentadienyl ligands in boiling xylene. Like the analogue (Me2SiSiMe2)[(eta(5)-t-BuC5H3)Fe(CO)](2)(mu-CO)(2) (2) reported previously, they are also found to exist as a mixture of cis and trans isomers that have been separated by preparative TLC. To examine the effect of larger substituents on the formation of isomers, the analogue (Me2Si)[{eta(5)C(5)H(3)(t-heptyl)}Fe(CO)](2)(mu-CO)(2) (4) was also synthesized by the same approach. The molecular structures of cis- and trans-(Me2Si)[(eta(5)-t-BuC5H3)Fe(CO)](2)(mu-CO)(2) have been determined by X-ray diffraction. (C) 1998 Elsevier Science S.A.