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- W2045152061 abstract "Abstract Compounds with the formula [Ln(pic) 3 ( trans -DTSO 2 ) 2 ] (Ln=La–Lu and Y) were obtained by reaction of hydrated lanthanide picrates with trans -1,3-dithiane-1,3-dioxide ( trans -DTSO 2 ) in absolute ethanol. Lanthanide contents were determined by titration with EDTA; CHN were determined by microanalytical procedures. Data are in good accordance with the proposed stoichiometry. IR absorption spectra were interpreted in terms of trans -DTSO 2 and picrate anions coordinated through the oxygen atoms. The parameters obtained from the absorption spectrum of the Nd(III) compound indicate weakly covalent metal–ligand bonds. The emission spectrum obtained at 77 K for the Eu(III) compound suggests a C 2v symmetry for the coordination polyhedron. X-Ray powder patterns show that the compounds are isomorphous. The structure of europium compound was determined by single crystal X-ray analysis and showed that the crystals are triclinic, space group P 1 , a =10.771(1) A, b =12.243(1) A, c =16.415(2) A, α =99.930(10)°, β =103.970(10)°, γ =106.220(10)°. The compound exhibits a polymeric structure, in which two trans -DTSO 2 are bridging the Eu(III) ions. The central ion is octacoordinated to four oxygens of trans -DTSO 2 and four oxygens of one bidentate and two monodentate picrate anions, in a bicapped trigonal prism geometry, the dihedral angle between the bases being 14.2(1) o ." @default.
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- W2045152061 date "2002-10-01" @default.
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- W2045152061 title "Synthesis and structure of lanthanide picrates with trans-1,3-dithiane-1,3-dioxide" @default.
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- W2045152061 doi "https://doi.org/10.1016/s0925-8388(02)00353-5" @default.
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