SYNTHESES AND CHARACTERIZATION OF THIOLATE-BRIDGED MANGANESE(II) COMPLEXES WITH NNS-TRIDENTATE THIOLIC LIGANDS

Manganese(II) complexes with 2-[(2-aminoethyl)amino]ethanethiol (HL(a)), 2-[(3-aminopropyl)amino]ethanethiol (HL(b)), 2-[(2-pyridylmethyl)amino]ethanethiol (HL(c)), and 2-[[2-(2-pyridyl)ethyl]amino]ethanethiol (HL(d))-[Mn(La)Cl]n (1), [Mn{Mn(L(b))(2)}(2)]Cl-2.2CH(3)OH (2), [Mn(L(c))Cl](n) (3), and [Mn(L(d))Cl(CH3OH)]n (4) have been synthesized and characterized by elemental analyses, infrared and electronic spectroscopies, and magnetic susceptibilities (80-300 K). The crystal structures of all these complexes were determined by the single-crystal X-ray diffraction method. Complexes 1 and 3 have a thiolate-bridged polymeric chain structure in which each manganese atom is five-coodinated in a trigonal bipyramid. Complex 2 is a thiolate-bridged trinuclear manganese(II) complex displaying a linear arrangement of the three manganese atoms with the two Mn-Mn interactions being equidistant [3.420(1) Angstrom]. Complex 4 is a thiolate-bridged polymeric infinite chain showing a distortion in the octahedral geometry around each manganese atom. The magnetic properties are discussed in relation to the crystal structures.