Abstract
The manganese(III) complex of tmtaa, (H2tmtaa = 7, 16-dihydro-6, 8, 15, 17-tetramethyldibenzo[b, i][1, 4, 8, 11]tetraazacyclotetradecinc). was prepared by a ligand exchange reaction and characterized by mass, infrared and electronic spectra as well as DSC measurement. The crystal structure has been determined by X-ray single crystal diffraclion. There are two crystallographically independent molecules of Mn(tmtaa)NCS in the asymmetric unit and one independent solvent molecule (acetonitrilc). The coordination around the manganese(III) is essentially a five-coordinate square pyramidal configuration with one nitrogen atom of an anionic NCS and four nitrogen atoms of a dianionic tmtaa. The average bond distances of Mn-N for tmtaa are 1969(6) and 1.961(3) Å, respectively. while the distances of the manganese to the nitrogen of NCS are 2.094(8) and 2.086(8) Å, respectively. The manganese(III) is displaced by 0.402 and 0.388 Å, respectively, from the N4 donor plane.
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