Cobalt(II), nickel(II) and copper(II) complexes of di-2-pyridyl ketone 3-piperidyl- and 3-hexamethyleneiminylthiosemicarbazones (HDPypip and HDPyhexim, respectively) have been prepared and characterized by physical and spectral methods. Use of 1: 2 thiosemicarbazone-to-metal chloride molar ratios in the preparation of the complexes has produced both mononuclear and polynuclear species for the three metal ions. Crystal structures of the HDPypip, HDPyhexim and [Ni(DPyhexim)Cl] have been determined and aid the assignments of the i.r., n.m.r., u.v. vis. n.i.r. and e.s.r. spectra for the various complexes.
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