Interaction of neptunium(V) with picolinic, nicotinic and isonicotinic acids
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Nina A. Budantseva
Summary
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.
© Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Measurement of fission neutron spectrum averaged cross sections of some threshold reactions on zinc: small-scale production of no-carrier-added 64Cu in a nuclear reactor
- Interaction of neptunium(V) with picolinic, nicotinic and isonicotinic acids
- Soil-to-fungi transfer of 90Sr, 239+240Pu, and 241Am
- Thermodynamic study of metal silicate complexation in perchlorate media
- Sorption of radionuclides from complexone solutions in liquid CO2
- Photochemical behaviour of Tc2OCl104– and TcnOy4n–2y+ in chloride media
- Effect of pH and fulvic acid on sorption and complexation of cobalt onto bare and FA bound MX-80 bentonite
- Inhibiting radiolysis of BTP molecules by addition of nitrobenzene
- Concentration of 99mTc-pertechnetate and 188Re-perrhenate
- Preparation of [61Cu]pyruvaldehyde-bis (N4-methylthiosemicarbazone) complex as a possible PET radiopharmaceutical
- Syntheses of two potential dopamine D4 receptor radioligands: 18F labelled chromeno[3,4-c]pyridin-5-ones
