SearchPublisher and Institutes
You are here: Home :: Area NEM :: Chemistry :: Physical chemistry
Nina A. Budantseva, Grigory B. Andreev, Alexander M. Fedoseev, Mikhail Yu. Antipin, Jean-Claude Krupa
Interaction of neptunium(V) with picolinic, nicotinic and isonicotinic acids
Keywords: Neptunium, Crystal structure, Stability constant, Complexation, Spectrophotometry
The interaction of Np(V) with all isomers of pyridinemonocarboxylic acid has been investigated, stability constants have been calculated using NIR spectroscopy. Single crystals of [NpO2(Pic)(H2O)2] (1), Cs[NpO2(Pic)2(HPic)]·3H2O (2), [NpO2(Nic)(H2O)] (3), and [NpO2(iso-Nic)(H2O)] (4) have been synthesized. Compound 1 contains infinite chains; compound 2 consists of isolated Cs+, [NpO2(Pic)2(HPic)]- groups and water molecules. In both 3 and 4 neptunoyl-ion NpO2 acts as monodentate ligand with one of the O atoms of NpO2 group entering in coordination polyhedron of the adjacent Np atom. Compounds 3 and 4 have layered and three-dimensional topologies, respectively. Crystallographic data: [NpO2(Pic)(H2O)2], space group P¯1, triclinic, a=6.380(2), b=7.733(2), c=10.700(4) Å, α=96.49(3), β=106.78(3), γ=103.83(3)°, and Z=2 (1); Cs[NpO2(Pic)2(HPic)]·3H2O, space group P¯1, triclinic, a=8.707(2), b=9.777(2), c=14.640(3) Å, α=76.633(15), β=78.75(2), γ=86.55(2)°, and Z=2 (2); [NpO2(Nic)(H2O)], space group P21/n, monoclinic, a=11.901(4), b=5.5628(15), c=12.124(3) Å, β=101.05(2)°, and Z=4 (3); [NpO2(iso-Nic)(H2O)], space group P212121, orthorhombic, a=5.742(3), b=8.550(5), c=18.512(10) Å, and Z=4 (4). Electron and IR spectra of solid compounds have been measured.
Radiochimica Acta, Oldenbourg Wissenschaftsverlag
Print ISSN: 0033-8230
Volume: 94, 02/2006
Pages: 069 - 074