Crystal structure and spectral studies of a novel manganese(II) complex of 4-phenyl-2-acetylpyridine thiosemicarbazone: Extended network of [Mn(Ac4Ph)2] via hydrogen bond linkages and π–π interactions

The reaction of Mn(CH3COO)2 · 4H2O with 4-phenyl-2-acetylpyridine thiosemicarbazone, HAc4Ph, yielded the novel six-coordinate complex [Mn(Ac4Ph)2]. The complex has been characterized by spectral (IR and EPR) and X-ray diffraction methods. EPR spectra were recorded with the external magnetic field oriented either perpendicular or parallel to the microwave magnetic field. In perpendicular mode, signals are observed in a wide spectral region. Of importance are the broad feature in the low field region and the broad absorption peaks at g ∼ 5.3 and g ∼ 3.07. The lack of resolved hyperfine patterns is attributed to a distribution on the zero field splitting parameters. The X-ray structural analysis showed that [Mn(Ac4Ph)2] has a centrosymmetric distorted octahedral geometry with the MnN4S2 chromophore. Intermolecular hydrogen bonds of the DAdouble bond; length as m-dashAD type and π–π interactions stabilize the structure and result in the formation of infinite layers.