Physicochemical studies on uranium(VI) complexes of N,N-dialkylamides

S.Sriram; P.B.Ruikar; M.S.Nagar; P.C.Kalsi; V.K.Manchanda

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Physicochemical studies on uranium(VI) complexes of N,N-dialkylamides

机译：N，N-二烷基酰胺铀（VI）配合物的理化研究

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Uranyl dinitrato complexes UO_2(NO_3)_2·2L with two N,N-dialkylamides, viz. N,N-dihexyloctanamide (L~1) and N,N-dihexyldecanamide (L~2) have been synthesized. IR spectra reveal that the amide molecules are O-bonded to U and both the nitrate ions act as bidentate groups. Visible spectra indicate the formation of a monodentate inner-sphere metal-amide complex. PMR spectra of the complexes indicate that presence of restricted rotation around the C-N bond. The variable temperature PMR studies suggest a dynamic equilibrium between the coordinated and free amide molecules. Thermal investigations reveal that decomposition proceeds in three TG stages with four exothermic DTA steps corresponding to the release of two molecules of amides and two nitrato groups, finally leading to U_3O_8.

机译：铀酰二硝基络合物UO_2（NO_3）_2·2L与两个N，N-二烷基酰胺的络合物。合成了N，N-二己基乙酰胺（L〜1）和N，N-二己基癸酰胺（L〜2）。红外光谱表明酰胺分子与O呈O键结合，而硝酸根离子均作为双齿基团。可见光谱表明形成单齿内球金属-酰胺络合物。配合物的PMR光谱表明存在围绕C-N键的受限旋转。可变温度PMR研究表明，配位酰胺和游离酰胺分子之间存在动态平衡。热学研究表明，分解过程在三个TG阶段进行，四个放热DTA步骤对应于两个酰胺分子和两个硝基基团的释放，最终导致U_3O_8。

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《Journal of the Indian Chemical Society》 |2002年第6期|共4页
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S.Sriram; P.B.Ruikar; M.S.Nagar; P.C.Kalsi; V.K.Manchanda;
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Physicochemical studies on uranium(VI) complexes of N,N-dialkylamides

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