Synthesis, crystal structure and some properties of new perrhenate and pertechnetate complexes of Nd3+ and Am3+ with 2,6-bis(tetramethylfurano)-1,2,4-triazin-3-yl)-pyridine, tris(2-pyridylmethyl)amine and N,N′-tetraethylmalonamide

The coordination complexes of trivalent f-element pertechnetates and perrhenates with some N-donor ligands were determined by using X-ray structural analysis: Nd3+ perrhenate with 2,6-bis(tetramethylfurano)-1,2,4-triazin-3-yl)-pyridine ([Nd(FBTP)3ReO4](ReO4)2 · 2H2O (I)), tris(2-pyridylmethyl)amine ([Nd(TPA)(ReO4)3] (II)) and N,N′-tetraethylmalonamide ([Nd(TEMA)4](ReO4)3 (III)). The coordination number of Nd is 10 in I, 9 in II and 8 in III. The complexes of Nd3+ pertechnetate and Am3+ pertechnetate with TPA have been also synthesized (Nd(TPA)(TcO4)3 (IV) and Am(TPA)(TcO4)3 (V)). The structure II does not change on replacement of perrhenate by pertechnetate and neodymium by americium.

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