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complexes is considerably more activated than in end-on mononuclear ones. For some of the complexes the structure M=N-N=M seems to be more appropriate than the structure with NN triple bond M-NIN-M. They illustrate very well four-electron mechanism of dinitrogen reduction discussed earlier. The results with protonation of bridging dinitrogen confirm the conclusion that dinitrogen ligand is strongly activated. Niobium and tantalum complexes form hydrazine quantitatively when protonated by HC1. Vanadium, molybdenum and tungsten complexes produce mainly ammonia, the