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

• Published in: Inorganic chemistry communications 2005-07, Vol.8 (7), p.619-622
• Main Authors: Kovala-Demertzi, Dimitra, Gangadharmath, Umesh, Demertzis, Mavroudis A., Sanakis, Yiannis
• Format: Article
• Language: English
• Subjects: Crystal structure; Epr study; Manganese complex; Thiosemicarbazone
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2005.04.002

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. Intermolecular hydrogen bonds of the DA AD type and π–π interactions stabilize the structure and result in the formation of infinite layers. 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 MnN 4S 2 chromophore. Intermolecular hydrogen bonds of the DA AD type and π–π interactions stabilize the structure and result in the formation of infinite layers.