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[An.sup.IV] [Fe.sup.II] [(CN).sub.6].x[H.sub.2]O (An = Th, U, Np) molecular compounds have been prepared by precipitation from acidic media. These microcrystalline compounds have been characterized by infrared spectroscopy, X-ray diffraction, and X-ray absorption spectroscopy. They have been found to be isostructural with the [Ln.sup.III]K[Fe.sup.II][(CN).sub.6].4[H.sub.2]O compounds. The molecular structures of these compounds are presented and their chemical formulas are given: in all compounds, the Fe[(CN).sub.6] octabedra is conserved and the An ion is linked to the N atoms of the CN ligands. The formal oxidation states are also discussed. Key words: hexacyanoferrate, actinide, EXAFS, XANES, X-ray absorption spectroscopy.

The title complexes, (C5H6N)[Ce(NO3)4(C15H11N3)]·C5H5N or (Hpy)­[Ce(NO3)4(terpy)]·py, (I) (py is pyridine, C5H5N, and terpy is ter­pyridine, C15H11N3), and [Ce(NO3)3­(C15H11N3)(CH4O)2] or [Ce(NO3)3(terpy)(OHCH3)2], (II), are 11-coordinate. The coordination polyhedron of the Ce atom in (I) is irregular, while that in (II) can be described as an icosahedron with two vertices replaced by one. [ABSTRACT FROM AUTHOR]

The title compound, aqua­tris­(nitrato)[2,4,6-tris(2-pyridyl)-1,3,5-triazine]samarium dihydrate, [Sm(NO3)3­(C18H12N6)­(H2O)]·­2H2O, was prepared from Sm(NO3)3·6H2O and 2,4,6-tris(2-pyridyl)-1,3,5-triazine. The metal atom is ten-coordinate being bonded to the terdentate TPTZ ligand, three bidentate nitrates and a water mol­ecule. [ABSTRACT FROM AUTHOR]