Studies on Co(II) and Co(III) complexes of di-2-pyridyl ketone N(4)-cyclohexyl and N(4)-phenyl thiosemicarbazones

Six new Co(II) and Co(III) complexes (1–6) of di-2-pyridyl ketone N(4)-cyclohexyl thiosemicarbazone (HL1) and di-2-pyridyl ketoneN(4)-phenyl thiosemicarbazone (HL2) have been synthesized and spectrochemically characterized. HL1 is newly synthesized and has been structurally characterized by single crystal X-ray diffraction studies, while HL2 has been previously reported. HL1 crystallizes into a monoclinic lattice with the space group P21. The complexes are characterized by magnetic, EPR, NMR and other spectroscopic studies. The EPR spectra of the paramagnetic complexes reveal axial features with eight hyperfine lines clearly resolved in the perpendicular region.

Graphical abstractSix new Co(II) and Co(III) complexes (1–6) of di-2-pyridyl ketone N(4)-cyclohexyl thiosemicarbazone (HL1) and di-2-pyridyl ketone N(4)-phenyl thiosemicarbazone (HL2) have been synthesized and spectrochemically characterized. HL1 is newly synthesized and has been structurally characterized by single crystal X-ray diffraction studies, while HL2 has been previously reported. HL1 crystallizes into a monoclinic lattice with the space group P21. The complexes are characterized by magnetic, EPR, NMR and other spectroscopic studies. The EPR spectra of the paramagnetic complexes reveal axial features with eight hyperfine lines clearly resolved in the perpendicular region.Figure optionsDownload full-size imageDownload as PowerPoint slide