N,N′ ,N″–tri(isopropyl)guanidinate complexes of M(V) (M = Nb, Ta) bearing imido ligands represent unique examples of monoanionic and dianionic guanidinate complexes of these metals; single crystal X-ray analyses for two of the latter species, {[µ-(NPri)3C]2TaMe(NPri)}(Mg2Cl2)·4C6D6 and {(µ-η2:η2 (PriN)3C)Ta(NPri)Cl}2, exhibit unusual bonding modes involving all of the nitrogen centers of the ligand.
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Thirupathi et al. (1999) studied this question.
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