2016. 57, 5 – UDC 548.73:547.13:546.711 CRYSTAL STRUCTURE OF A NEW MANGANESE(III) COMPLEX WITH TETRADENTATE SCHIFF BASE N,N-O-PHENYLENEBIS(4-METHOXYSALICYLIDENEIMINE) A. Ghaemi1, B. Keyvani1, S. Rayati2 , S. Za rei 1, B. No t a s h 3 2Department of Chemistry, K.N. Toosi University of Technology, Tehran, Iran 3Department of Chemistry, Shahid Beheshti University, G.C., Evin, Tehran 1983963113, Iran 1Department of Chemistry, Saveh Branch, Islamic Azad University, Saveh, Iran E-mail: akbar.ghaemi@yahoo.com Received February, 19, 2015 A new manganese(III) complex [Mn(L)(NCS)] (1) is synthesized from the Schiff base ligand N,N-O-phenylenebis(4-methoxysalicylideneimine) (H2L: derived from the condensation of 4-methoxy salicylaldehyde with O-phenylene-diamine) with Mn(NO3)24H2O and KSCN in a methanol/water solvent mixture. <...> This complex is characterized by elemental analysis, FT-IR and single crystal X-ray diffraction. <...> It crystallizes in a monoclinic system, with space group P21/c and four molecules in the unit cell (Z = 4). <...> The crystal structure shows [Mn(L)(NCS)] units joined together by the Mn S secondary bonding interaction (SBI) to form infinite zigzag chain structures. <...> DOI: 10.15372/JSC20160525 Keywords: synthesis, tetradentate Schiff base ligand, Mn(III), crystal structure, N,N-Ophenylenebis(4-methoxysalicylideneimine), X-ray diffraction analysis. <...> In recent years extensive studies have been focused on the chemistry of manganese(III) complexes with Schiff base ligands because of growing interest in the field of molecular magnetism, metalloenzymes, and inhibitors of xanthine oxidase and in the understanding of their catalytic activities in various reactions [ 1—18]. <...> Researchers have previously reported the crystal structures of MnIII complexes with closely related N2O2 donor Schiff base ligands [ 5, 13, 17, 19, 20 ]. <...> Elemental analysis (C,H,N) was performed using a Heraeus Elemental Analyzer CHN-O-Rapid. <...> Infrared spectra were recorded as KBr pellets using Unicam Matson 1000 FT-IR. <...> The H2L ligand was prepared by the reported procedure [ 9 ]. <...> The complex was synthesized by adding N,N-Ophenylenebis(4-methoxysalicylideneimine <...>