Synthesis and characterization of heteroleptic iron(II) thiolate complexes with weak iron–arene interactions
摘要:
Selective preparation and characterization of a series of heteroleptic thiolate complexes of iron(II) are described. The compounds were synthesized by treatment of iron bis-amide Fe{N(SiMe3)(2)}(2) (1) with 1 equiv. of terphenyl thiols HS(2,6-(aryl)(2)C6H3) followed by addition of another equivalent of different thiol. An amide-thiolate intermediate [{(Me3Si)(2)N}Fe](2)(mu-SDpp)(2) (2; Dpp = 2,6-Ph2C6H3) was isolated from the 1:1 reaction of I and HSDpp. The X-ray crystal structures of all new thiolate complexes have been determined. The compounds crystallize as monomers or dimers, dependent on the substituents. They consist of distorted tetrahedral or trigonal-pla nar iron centers with weak interactions between the aromatic rings of thiolate ligands, where the Fe-C(arene) contact is 2.272(2) A at shortest. The stronger iron-arene interaction appears to induce more pyramidalized geometry at the iron center. (C) 2007 Elsevier B.V. All rights reserved.