<sup>25</sup>Mg<sup>2+</sup> Nuclear Magnetic Relaxation in Aqueous Solution

Holz, Manfred; Günther, S.; Lutz, O.; Nolle, A.; Schrade, P. G.

doi:10.1515/zna-1979-0802

Cited by 9 publications

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“…Also, we believe that in studying cation -nitrate ion association 14N nmr is generally more informative than nmr studies of the metal nuclide since the interpretation of metal nuclide relaxation data is difficult (e.g. 2 5~g nmr studies of Mg(N03)2 (39,40)). …”

Section: Methodsmentioning

confidence: 99%

A nuclear magnetic resonance study of aqueous solutions of several nitrate salts

Nicholas¹,

Wasylishen²

1987

Can. J. Chem.

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A. MARTIN DE P. NICHOLAS and RODER~CK E. WASYLISHEN. Can. J. Chem. 65, 951 (1987).Rotational correlation times for the end-over-end rotation of the C3 symmetry axis of the nitrate anion in the temperature range 3-80°C are studied by nuclear magnetic resonance spectroscopy for a variety of nitrate salts in aqueous solution. The counterion is found to retard the rotation of the anion in the following order: sc3+ > La3+ > pb2+ > Ca", s r 2 + > ~l~+ , K + , Nai, (CH3)?N+ > Zn2+, Mg2+, Li+, NH4+, H 3 0 + . This relative order is discussed in terms of the association of the nitrate ion with the cation. Oxygen-17 nmr spin-lattice relaxation times in combination with I4N nmr T I values are used to derive rotational diffusion constants for the in-plane rotations of the nitrate anion. In all cases the in-plane rotations are found to be slower than the corresponding end-over-end motion.A. MARTIN DE P. NICHOLAS et RODERICK E. WASYLISHEN. Can. J. Chem. 65, 951 (1987).Operant 21 des temperatures allant de 3 B 80°C et faisant appel a la spectroscopie rmn d'une variCt6 de nitrates en solution aqueuse, on a determine les temps de corrClation rotationnelle pour la rotation d'un bout j. l'autre de l'axe de rotation C3 de I'anion nitrate. On a trouvC que le contre ion retarde la rotation de l'anion dans l'ordre suivant : Sc3+ > La3+ > Pb2+ > Ca2+, Sr2+ > A I~' , K', Na+, (CH3),N+ > ~n " , M~~+ , Li', NH,', H30'. Ondiscute de cet ordre relatif enfonction de l'association de I'ion nitrate avec le cation. On a utilisC les temps de relaxation spin-rCseau de la rmn du 170 de concert avec les valeurs T I de la rmn du I4N pour obtenir les valeurs des constantes de diffusion rotationnelle pour les rotations dans le plan de l'anion nitrate.Dans tous les cas, on a trouve que les rotations dans le plan sont plus lentes que le mouvement correspondant d'un bout i l'autre.[Traduit par la revue] IntroductionNuclear magnetic resonance spectroscopy is one of several techniques available for studying the rotations of ions in solution (1-4). The ease of application and sensitivity of this method make it an attractive choice, especially for studying more dilute solutions. Recently we have shown (5) the importance of using I4N and 170 nmr spin-lattice relaxation measurements to studv the rotations of the nitrate and carbonate anions in aqueous solution in the presence of the sodium cation. We found rotations of the carbonate ion to be more hindered than those of the nitrate anion because of stronger cation-anion pairing and stronger anion-solvent interactions (hydrogen bonding). Some evidence for ion association was found for NaN03 at solute concentrations of 1 M; however, ion pairing is much more important for the divalent carbonate anion.

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Section: Methodsmentioning

confidence: 99%

A nuclear magnetic resonance study of aqueous solutions of several nitrate salts

Nicholas¹,

Wasylishen²

1987

Can. J. Chem.

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“…Figure 1 shows a stacked plot of the Tl-measurement of 5~ in VOC13 together with experimental parameters. For evaluating T 1 the peak intensities were used for a two-parameter least-squares fit procedure [8]. The measurements of the ratios of the Larmor frequencies were performed with a high resolution probe with internal 2H NMR stabilization.…”

Section: Methodsmentioning

confidence: 99%

Measurement of50V and51V nuclear moments by nuclear magnetic resonance methods

et al. 1981

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From measurements of the Larmor frequencies of 2H, 5~ and 51V in aqueous vanadate solution the ratio of the gl-factors of 5~ and 5~V and the nuclear magnetic moments of 5~ and S~V are derived. The ratio of the longitudinal relaxation times T 1 in VOC13 yields the ratio of the quadrupole moments ]Q(5~ In the 3d 3 4s 2 4F3/2 atomic ground state the hyperfine structure anomaly is smaller than 1-10 -5.

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