In:
Radiochimica Acta, Walter de Gruyter GmbH, Vol. 94, No. 2 ( 2006-2-1), p. 69-74
Abstract:
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 [NpO 2 (Pic)(H 2 O) 2 ] ( 1 ), Cs[NpO 2 (Pic) 2 (HPic)]·3H 2 O ( 2 ), [NpO 2 (Nic)(H 2 O)] ( 3 ), and [NpO 2 (iso-Nic)(H 2 O)] ( 4 ) have been synthesized. Compound 1 contains infinite chains; compound 2 consists of isolated Cs + , [NpO 2 (Pic) 2 (HPic)] - groups and water molecules. In both 3 and 4 neptunoyl-ion NpO 2 acts as monodentate ligand with one of the O atoms of NpO 2 group entering in coordination polyhedron of the adjacent Np atom. Compounds 3 and 4 have layered and three-dimensional topologies, respectively. Crystallographic data: [NpO 2 (Pic)(H 2 O) 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[NpO 2 (Pic) 2 (HPic)]·3H 2 O, 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 ); [NpO 2 (Nic)(H 2 O)], space group P 2 1 / n , monoclinic, a = 11.901(4), b = 5.5628(15), c = 12.124(3) Å, β = 101.05(2)°, and Z = 4 ( 3 ); [NpO 2 (iso-Nic)(H 2 O)], space group P 2 1 2 1 2 1 , 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.
Type of Medium:
Online Resource
ISSN:
2193-3405
,
0033-8230
DOI:
10.1524/ract.2006.94.2.69
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2006
