Abstract
Treatment of the λ 3-cyclotriphosphazanes, cis-{EtNP(OR)} 3 [R=C 6H 4Br-4 (L 1) or C 6H 4Br-2 (L 2)] with [Mo(CO) 4(NBD)] (NBD = norbornadiene) yields the mononuclear complexes [Mo(CO) 4L 1] (1) and [Mo(CO) 4L 2] (2), which have been characterised by IR, NMR ( 31P and 1H) and FAB mass spectral data. The structure of 1 has been confirmed by single crystal X-ray analysis. The structural and conformational changes brought about by complexation are discussed in terms of a bonding model based on negative hyperconjugation.
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