Three different bonding modes in one molecule! The diazapentadienyl ligands in the title compound 1 adopt η1,η1-N,N-chelating plus η5-terminal, η1η1-N,N chelating plus η5-bridging, and novel η1-N plus η3-1-aza-allyl bonding modes. R=cyclohexyl.
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Clegg et al. (1998) studied this question.