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Some transition metal 4-methylpiperazine-1-carbodithioic acid complexes with perchlorate as counter anion of the general formula [M(LH) n ](ClO 4 ) n (LH 5 4-methylpiperazine-1-carbodithioic acid, M 5 Co(II), Ni(II), Cu(II) and n 5 2; M 5 Fe(III) and n 5 3) have been prepared and characterized by elemental analyses, conductance, infrared and electronic absorption spectra and room-temperature magnetic susceptibility measurements. A square-planar structure for the complexes of the type [M(LH) 2 ](ClO 4 ) 2 (M 5 Co(II), Ni(II), Cu(II)) and the existence of a high spin-low spin equilibrium phenomenon for [Fe(LH) 3 ](ClO 4 ) 3 have been proposed. The former complexes exhibit 1 : 2 while the latter complex exhibits 1 : 3 electrolytic behavior, respectively.

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