The shape of NMR absorption line for typical ionic crystals, molecular crystals, and glasses is studied. The proposed theory and available experimental results suggest that the shape of NMR spectra of conventional dielectric crystals (and even molecular) is the convolution of a frequency-truncated nearly-rectangle-shaped function (characteristic oscillations in free precession signals) and a Gaussian-like function. A Gaussian-like shape of the spectra of glasses with a rigid structure (no oscillations in the free precession signal) is probably associated with a random scatter of interatomic distances. The results are interpreted within the framework of the proposed theory. It is demonstrated that, at least for solids the lattice of which contains no isolated groups of nuclei and are not quasi-one-dimensional, the structure only weakly affects the shape of the spectrum, which in turn is associated with the onset of dynamic chaos in the spin system.

1,7-Diamino-4-oxypentane-1,1,7,7-tetraphosphonic acid has been synthesized while searching for potential components for 153Sm radiopharmaceuticals. Its interaction with samarium(III) cation has been studied by 13C and 31P NMR spectroscopy in comparison with 1,5-diamino-3-oxypentane-N,N'-tetra-(methylenephosphonic acid) which is the ligand component of the osteotropic drug Samarium 153Sm oxabifore. NMR spectroscopy provides a simple, convenient, and informative method for studying interactions between the ligand and prospective radionuclide cation.

The known methods of preparation of cyclen-containing phosphonic acids, promising components of radiopharmaceuticals, have been improved, and new approaches have been developed. Application of 31Р and 13С NMR spectroscopy for initial screening of complex formation between cyclen-containing phosphonic acids and Ga3+ in D2O has been demonstrated. The conditions of 68Ga complex formation with cyclencontaining phosphonic acids and estimation of their radiochemical yield in water by means of thin-layer chromatography have been elaborated. A correlation between the NMR and TLC data has been found. Biological distribution of the selected 68Ga radiopharmaceuticals has been determined in vivo from the positron emission tomography data. The obtained standardized uptake values point at the osteotropicity of the 68Ga compounds.

Water- and hydrogen-containing amorphous quartz and sodium and aluminum silicates were studied by H-1 and Na-23 NMR spectroscopies. In quartz glasses, water is present only in the form of OH groups; however, in glasses treated for a short time, the water exists predominantly in the form of water macroclusters. The rest of the glasses studied were found to contain, along with hydroxyls, inclusions of nondissociated water of three types: macroclusters (comprised of 10(2)-10(3) H2O molecules), small clusters (similar to10 molecules), and isolated water molecules. The structure and properties of these forms of water and the structure of amorphous matrices were studied.

Tris-(8-hydroxyquinolates) of aluminum(iii), chromium(iii), and iron(iii) in the presence of triphenylphosphine oxide efficiently catalyze the formation of alkylenecarbonates by the reaction of CO2 with oxiranes, viz., propylene oxide, but-2-ene oxides, and isobutylene oxide. The catalytic system is active at 140—170 °C and a CO2 pressure of 15—100 atm.

The concentration dependences of the NMR parameters of the (1)H, (14)N, (17)O, (23)Na, and (133)Cs nuclei in the MNO(3)-HNO(3) systems with M = Na(+), K(+), Cs(+), and NO(2)(+) are studied in detail. It is found that, similar to the other liquid electrolyte systems with hydrogen bonds, in some cases these dependences are described by the piecewise linear functions accounting for the in-pair dynamic equilibrium between the predominant diffusion-averaged solvate structures-ideal configurations playing role of the "elementary cells" of a solution. The results are compared with those obtained for the N(2)O(5)-HNO(3) system, for which the heat of mixture was previously found to exhibit anomalies in the singular points of the concentration dependences of NMR parameters. The composition of the system in the singular points is studied as a function of the cation size and shape. The conclusion is drawn that the packing factors (shape and relative sizes of the ions, molecules, and supramolecular structures) strongly influence the manifestations of the effects studied.

2-Hydroperfluoropropyl azide is an efficient fluorinating agent for various phosphorous acid derivatives.

Shifting of the PMR signal of the CH proton to the strong field with an increase in the positive charge on the proton was found in nitroalkanes and nitrocarboxylic acid esters. This shift is due to the presence of steric interactions between the substituents and the CH proton, which are manifested by a change in the paramagnetic contribution to the magnetic shielding constant.

ChemInformVolume 20, Issue 27 Preparative Organic Chemistry ChemInform Abstract: Substitution of Halogen in α-Halonitroalkanes. Part 3. Preparation and Properties of Nitrosulfoacetic Acid Ester Sodium Salts (III). A. I. YURTANOV, A. I. YURTANOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorA. V. YARKOV, A. V. YARKOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorT. I. IGNAT'EVA, T. I. IGNAT'EVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorV. O. ZAVEL'SKII, V. O. ZAVEL'SKII Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorB. K. BEZNOSKO, B. K. BEZNOSKO Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorO. V. NOVIKOVA, O. V. NOVIKOVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorV. N. SEMENOVA, V. N. SEMENOVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorI. V. MARTYNOV, I. V. MARTYNOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this author A. I. YURTANOV, A. I. YURTANOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorA. V. YARKOV, A. V. YARKOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorT. I. IGNAT'EVA, T. I. IGNAT'EVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorV. O. ZAVEL'SKII, V. O. ZAVEL'SKII Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorB. K. BEZNOSKO, B. K. BEZNOSKO Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorO. V. NOVIKOVA, O. V. NOVIKOVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorV. N. SEMENOVA, V. N. SEMENOVA Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this authorI. V. MARTYNOV, I. V. MARTYNOV Inst. fiziol. akt. veshch. AN SSSR, ChernogolovkaSearch for more papers by this author First published: July 4, 1989 https://doi.org/10.1002/chin.198927127AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume20, Issue27July 4, 1989 RelatedInformation

Based on a study of the13C and17O NMR spectra of four macrocyclic polyethers, a difference in the character and mechanism of coordination of the ether and anisole oxygen atoms of the macroring with calcium was found during complexing.

The reaction of esters of chloro- and bromonitroacetic acids (I) with NaHSO3, Na2SO3, and Na2S2O4, has resulted in the formation of Na-salts of esters of nitrosulfoacetic acid.

With the object of studying the influence of the redistribution of electron density on /sup 13/C NMR and /sup 19/F chemical shifts seven halonitromethanes were synthesized and their /sup 13/C and /sup 19/F NMR spectra were determined. Calculations were made of the compounds synthesized and similar compounds by various quantum-chemical methods. On the whole, the chemical shifts correlate with the charge distribution in the magnetic-shielding constant.

PMR spectra of a series of chloronitroacetic acid esters were studied.