The dinuclear and mononuclear nickel(I) thiolates, [Ni(PPh3)(μ-SR)]2 (1a: R is 2,4,6-triisopropylphenyl (Tip), 1b: R is 1-adamantyl (Ad)), (DxpS)Ni(μ-SDxp)Ni(PPh3) (2) (Dxp is 2,6-dixylylphenyl), and Ni(SDmp)(PPh3) (3) (Dmp is 2,6-dimesitylphenyl), have been synthesized by the reaction of the nickel(I) amide NiN(SiMe3)2}(PPh3)2 with the corresponding thiols. The two nickel centers of 1a and 1b are equivalent
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 FeN(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.
Synthesis of Coordinatively Unsaturated Mesityliron Thiolate Complexes and Their Reactions with Elemental Sulfur
The reactions of Fe(2)Mes(4) (1; Mes = mesityl) with bulky thiols, namely, HSDmp (Dmp = 2,6-dimesitylphenyl), HSDxp (Dxp = 2,6-dixylylphenyl), and HSBtip [Btip = 2,6-(2,4,6-(Pr3C6H2)-Pr-i)(2)C6H3], provided a series of iron(II) mesityl complexes bearing bulky thiolate ligands. These iron complexes are the thiolate-bridged dinuclear complexes Fe(2)Mes(2)(mu-SAr)(mu-Mes) (2a, Ar = Dmp; 2b, Ar = Dxp), the 1,2-dimethoxyethane (DME) adducts (DME)Fe(SAr)(Mes) (3a, Ar = Dmp; 3b, Ar = Dxp), the mixed-valence Fe-I-Fe-II dinuclear complexes (Mes)Fe(mu-SAr)(mu-SAr)Fe (4a, Ar = Dmp; 4b, Ar = Dxp), and a low-coordinate mononuclear complex (BtipS)Fe(Mes) (5). An [Fe8S7] cluster [Fe4S3(SDmp)](2)(mu-SDmp)(2)(mu-SMes)(mu(6)-S) (6), the core structure of which is topologically relevant to that of the FeMo-cofactor of nitrogenase, was obtained from the reaction of 3a or 4a with S-8. The mu-SMes ligand in 6 is formed via insertion of a sulfur atom into the Fe-C(Mes) bond. The formation of cluster 6 from 3a or 4a demonstrates that organoiron complexes are applicable as precursors for iron-sulfur clusters.