Tris(2-pyridylmethyl)amine (tpa) coordinates to oxorhenium(V) with two pyridyl and one amino nitrogen atoms leaving one 2-pyridylmethyl arm uncoordinated, giving a series of complexes, [Re(O)(L)(η3-tpa)]+ (L is chelating dianion), due to strong trans influence of the oxo ligand.
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Sugimoto et al. (1997) studied this question.
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