Adaptable metallaboratranes: A tris- (phosphino)borane ligand stabilizes both low-valent FeN2 complexes and a mid-valent imido species with a FeNAr bond, thanks to its ability to shuttle between trigonal-bipyramidal and pseudotetrahedral geometries by elongation of the apical iron–boron bond (see picture).
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Moret et al. (2011) studied this question.
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