Uranyl amide

Fig. 57a. A typical multilayered cloth made cf potassium tartaric amide 31b at pH 5. Its observed physical shape is fortuitous. (Negative stain, uranyl acetate 1%). b Freeze-etching erf a similar multilayer made of the sodium salt 31a. At higher magnification (below), the bilayer profiles become visible (Pt/C shadowed), c Fiber pattern of 31a. (Negative stain, uranyl acetate 1%). d Digitized area of the fiber bundle taken from (c). e Fourier transform of the input image from (d), as obtained by calculating the reciprocal space frequencies (x-y exchanged). Two intense spots yield a periodical pattern of 38.78 A [376]...

Andersen prepared the first U amide traHj-[UO2 N(SiMe3)2 2(thf)2] (60) in 1979, from UO2CI2 and 2Na[N(SiMe3)2] in f. The structure of the ciystalline material was confirmed by X-ray data, albeit of poor quality recently a high-quality structure was obtained. The amido groups in 60 were readily displaced by treatment with ArOH and pyridine, yielding [UO2(OAr)2(py)3] (Ar = C6H3P 2-2,6). Reaction of 60 with the macrocyclic compound H4(10) (R = H or Me) resulted in the exclusive formation of the mono-uranyl complex [UO2 H2(10) (thf)] (61). " The latter upon addition of... 

Gupta, K.K., Manchanda, V.K., Srirarn, S. et al. 2000. Third phase formation in the extraction of uranyl nitrate by N,N-dialkyl aliphatic amides. Solvent Extr. Ion Exch. 18 (3) 421-439. 

Uranyl chloride, 5 148 Uranyl orthophosphate 4-hydrate, U02HP04-4H20, 5 150 analysis of, 5 151 Urazine (4-aminourazole), 4 29 from carbohydrazide, 4 30 from carb ohydrazide-V-carb ox-amide, 4 31 salts of, 4 31 Urazole, 5 52... 

Sarsfield reported the only three known examples of uranyl bis(imino-phosphorano)-methanides reported to date.52,53 Treatment of the tris-THF adduct of anhydrous uranyl dichloride with one molar equivalent of 2 resulted in the isolation of dimeric 101 when the recrystallisation was carried out in dichloromethane, but monomeric 102 when recrystallised from THF. Both 101 and 102, when treated with two and one equivalents, respectively, of potassium bis(trimethylsilyl)amide afford 103. Complexes 101-103 all exhibit uranyl-methanide contacts in the solid state and these represent noteable examples of out-of-equatorial-plane uranyl coordination. A DFT study concluded that the methanide centre coordinates to the uranyl centre with an orbital of p-type character by a highly polarised cr-type interaction. 

Complexes of uranyl chloride with a variety of oxygen donor ligands continue to be reported, notably with phosphine oxides (55), pyridine N-oxides (27), N,IV-dimethylformamide (7J), acetamide (15), and with the N,IV,IV, IV -tetramethyldicarboxylic acid amides (14), the last being mainly polymeric compounds. A few similar complexes of uranyl bromide (54) and iodide (71) are also known. 

Teramoto, M., Fu, S.S., Takatani, K., Ohnishi, N., Maki, T., Fukui, T., and Aral, K., Treatment of simulated low level radioactive wastewater by supported Uquid membranes Uphill transport of Ce(III) using CMPO as carrier. Sep. Purif. Tech., 1999, 18 57-69. Gupta, K.K., Manchanda, V.K., Sriram, S., Thomas, G., Kulkami, P.G., and Singh, R.K., Third phase formation in the extraction of uranyl nitrate by iV2V-dialkyl aUphatic amides. Solv. Extr. Ion Exch., 2000, 18 421 39. 

Extraction of uranyl with all three amides was always much higher from the SCN solution than from the NOa" solution, possibly indicating a more stable U VSCN complex. IR spectra and H-NMR data confirm the bonding of the amide carbonyl directly to the metal ion in all three ligands. Lack of OH stretching modes in the IR spectra eliminates the presence of water in the extracted complexes. IR data also confirms direct bonding on NOs" and SCN to the metal. These analyses confirm the slope analysis observations." ... 

Reinhoudt and co-workers (236, 237) first reported independently anion receptors (e.g. 122) based on this kind of methodology in 1992. These receptors contained a Lewis acidic neutral uranyl salene group and hydrogen-bonding secondary amide functionalities. Receptors such as 123, containing solely the... 

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