Uranyl(VI) and lanthanum(III) thio-diglycolamides complexes: Synthesis and structural studies involving nitrate complexation

Synthesis, structural and emission studies of a bis (carbamoyl methyl) sulfone complex of uranyl nitrate

“…In addition that the sulfoxide group is a better donor towards the metal centre compared to that of sulfone group and therefore the coordination of sulfoxide and carbamoyl groups to uranyl ion is seen with ligand (e) [20]. The structure 1 is very similar to that reported for the uranyl nitratemalanoamide complex [UO 2 (NO 3 ) 2 ( i C 3 H 7 ) 2 NCOCH 2 CON( i C 3 H 7 ) 2 ] [17] and the bis(carbamoylmethyl) sulfide complex [UO 2 (NO 3 ) 2 ( i Bu 2 NCOCH 2 SCH 2 CON i Bu 2 )] [15], in which the malonamide or bis (carbamoylmethyl) sulfide acts as a bidentate chelating ligand and bonds through both the carbomoyl oxygen atoms to the uranyl nitrate. The coordination number around uranium(VI) in 1 is eight and the geometry is hexagonal bipyramidal.…”

“…The 1 HNMR spectrum shows the expected peak multiplicities and integration. The SO 2 -CH 2 -CO protons showed a singlet at δ 4.50 ppm, indicating that the compound is pure and different from the starting sulfide or the intermediate sulfoxide [15,20]. The C, H, N analysis supports the expected stoichiometry for the ligand.…”

“…The coordination chemistry of uranium is growing rapidly in the last ten years due to the presence of new synthetic methods available [3] and also the interesting properties such as selective ion-exchange, mixed valency, ionic conductivity, enhanced fluorescence, magnetic ordering and nonlinear optical properties exhibited by its complexes [4][5][6][7][8][9][10]. Completely incinerable diamide based extractants such as: malonamide [11], diglycolamide [12,13], glutaramide [14], thioglycolamide [15] and bis(carbamoylmethyl) sulfoxide [16] [ Fig. 1(a)-(e)] were studied extensively for the separation of actinide ions from acidic medium.…”

“…For example the malonamide acts as a chelating ligand with bidentate bonding through both the carbamoyl oxygen atoms [17], while the glutaramide, acts as a bridging bidentate ligand to give a linear polymeric arrangement [18]. The diglycolamide acts as a tridentate chelating ligand [19], whereas, the analogous thiodiglycolamide acts as a bidentate chelating ligand in a similar fashion to malonamides [15]. The oxidation of sulfur atom of the thiodiglycolamide to form a sulfoxide gives rise to a bidentate chelating mode of bonding through sulfoxo and one of the carbomyl groups leaving one carbamoyl group un coordinated [20].…”

Influence of the first coordination of uranyl on its luminescence properties: study of uranyl binitrate with N,N-dialkyl amide DEHiBA and water

“…12,21 One should point out that the nitrates can be located either in cis-or trans-position. Although there are cases reported in the literature involving a cis-conformation around the uranyl moiety, 12,13,22 they are far less common than the trans conformation. As the two conformations exist in crystals, they might both be present in nitric acid solution and in organic phases.…”