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The aim of this work was to examine in closer detail the reduction of dinitrogen coordinated to molybdenum and tungsten and in particular the reactivity of hydrazido(2-) complexes. A brief introduction to nitrogen fixation is presented in Chapter 1 and chemical models of biological nitrogen fixation are discussed. The influence of ligand environment on the further reactions of hydrazido(2-) complexes is the subject of Chapter 2 whilst Chapter 3 describes the isolation of novel hydrido-, hydrazido(2-) complexes of tungsten and the X-ray structure of [WCl3(NNH2) - (PMe2Ph)2] Recent applications of 15 N nuclear magnetic resonance spectroscopy in coordination chemistry are reviewed in Chapter 4 introducing results of spectroscopic studies of 15N-labelled dinitrogen and hydrazido(2-) complexes. Attempts to prepare novel hydrazido(2-) complexes of tungsten are described in Chapter 5. A discussion of the results presented in Chapter's 2-5 is given in Chapter 6.