A chalcogen-stabilized cluster containing a s-trans-1,3-diene ligand: Synthesis and structural characterization of {(CO)(6)Fe2Se2}(2)(mu-s-trans-C4H2)

Abstract

Reaction of(CO)(6)Fe-2(mu-Se)(2) with HC=CC=CR (R = SiMe(3) or Sn(n)Bu(3)) at room temperature in methanol containing sodium acetate yielded the unexpected product {(CO)(6)Fe2Se2}(2)(mu-s-trans-C4H2) in which a 1,3-butadiene ligand is coordinated to the Fe2Se2 core in a trans conformation as determined by a single-crystal X-ray diffraction studies. The complex was also obtained with a low yield by reaction of(CO)(6)Fe-2(mu-Se)(2) with HC=CC=CH under similar conditions.