SYNTHESES AND STRUCTURAL CHARACTERIZATION OF DINUCLEAR AND TRINUCLEARIRON(II) COMPLEXES OF TRIDENTATE THIOLIC LIGANDS WITH AN NNS DONOR SET

Thiolate-bridged complexes of iron(II) with 2-[(2-aminoethyl)amino]eth anethiol (HL(a)), 2-[(3-aminopropyl)amino]ethanethiol (HL(b)), and 2-[ [2-(2-pyridyl)ethyl]amino]ethanethiol (HL(c)) - [Fe{Fe(L(a))(2)}(2)]-( ClO4)(2)(CH3OH)-C-. (1), [Fe{Fe(L(b))(2)}2]Cl(2)(.)2CH(3)OH (2), and [ Fe-2(L(c))(2)(NO3)(2)] (3), respectively - have been synthesized and c haracterized by elemental analyses, and infrared and electronic spectr oscopies as well as magnetic susceptibilities (80-300 K). The crystal structures of all of these complexes have been measured by single-crys tal X-ray diffraction. Each of complexes 1 and 2 has a thiolate-bridge d trinuclear iron (II) structure showing a linear arrangement of the t hree iron atoms with a geometry that may be described as Oh-Td-Oh. Com plex 3 is a thiolate-bridged dinuclear iron (II) molecule, in which ea ch iron atom is coordinated in a distorted octahedron. The electronic spectroscopic and magnetic properties are discussed in relation to the crystal structures.