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 pi-pi interactions

摘要

The reaction of Mn(CH_3COO)_2.4H_2O 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 DA=AD type and n-n interactions stabilize the structure and result in the formation of infinite layers.