Abstract: Treatment of (meso-tetra-p-tolylporphyrinato) manganese (V) nitride,(TTP) Mn= N, with (octaethyl-porphyrinato) manganese (II), Mn (OEP), in toluene leads to the reversible transfer of the nitrido ligand between the two metal complexes to form (OEP) Mn= N and Mn (" P). The net result is a formal threeelectron reduction of (" P) MnVN to (" P) Mnl*. This occurs with a second-order rate constant of (5.6 f 1.2) X lo3 M-'sI to form an equilibrium ...