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The first complexes containing a manganese-nitrogen triple bond, nitrido(octaethylporphinato) manganese(V) [MnN(OEP)]** and nitrido[meso-tetra(p-tolyl)porphinato]manganese( V) [MnN(TTP)], are prepared by hypochlorite oxidation of the corresponding methoxomanganese( III) porphyrins, Mn(OEP)OMe and Mn(TTP)OMe, in the presence of ammonia. The red, pentacoordinated, diamagnetic species are identified by UV/VIS-, IR-,  1 H NMR, and mass spectra. While the isoelectronic oxochromium(IV) or oxomolybdenum( IV) porphyrins behave as weak oxidants or reductants, respectively, the nitridomanganese( V) unit in the square pyramidal environment is chemically remarkably stable.

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Metallkomplexe mit Tetrapyrrol-Liganden, XXVIII. Mononukleare Nitridomangan(V)-Porphyrine: die ersten Mangan-Stickstoff-Dreifachbindungen/ Metal Complexes with Tetrapyrrole Ligands, XXVIII. Mononuclear Nitridomanganese(V) Porphyrins: the First Manganese Nitrogen Triple Bonds