scholarly journals Fourier Transform NM R Investigations of 77Se in Aqueous Solutions

1978 ◽  
Vol 33 (9) ◽  
pp. 1025-1028 ◽  
Author(s):  
W. Koch ◽  
O. Lutz ◽  
A. Nolle
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Aqueous Solutions ◽  
Magnetic Moment ◽  
Infinite Dilution ◽  
Chemical Shifts ◽  
Relaxation Times ◽  
Recovery Method ◽  
A Value ◽  
Nmr Signals

In solutions of H2SeO3, Na2SeO3 , NaHSeO3 and Na2SeO4 in H2O NMR signals of 77Se have been observed. In these solutions chemical shifts were determined. In a 4 molal solution of Na2SeO3 the ratio of Larmor frequencies υ(77Se)/υ(1H) has been measured with a high-resolution probe. A value of the magnetic moment of 77Se in Na2SeO3 at infinite dilution in H2O is given: |μ(77Se)| = 0.533 299 6(7)μN. Relaxation times T1 have been measured by the inversion-recovery method. In a 4 molal solution of Na2SeO3 in H2O a NOE enhancement of 0.4(1) could be observed.

55Mn NMR Studies in Aqueous Permanganate Solutions

1974 ◽  
Vol 29 (10) ◽  
pp. 1467-1470 ◽  
Author(s):  
O. Lutz ◽  
W. Steinkilberg
Keyword(s):  
Chemical Shift ◽  
Aqueous Solutions ◽  
Concentration Dependence ◽  
Magnetic Moment ◽  
Infinite Dilution ◽  
High Accuracy ◽  
Solvent Isotope Effect ◽  
Nmr Studies ◽  
Solvent Isotope ◽  
Nmr Signals

Abstract The NMR signals of the nuclei 55Mn and 2H have been investigated in aqueous solutions of permanganates. The concentration dependence of the NMR signals of 55Mn has been determined in potassium permanganate solutions in H2O and D2O and a large solvent isotope effect on the chemical shift of 55Mn has been established. The ratio of the Larmor frequencies of 55Mn relative to 2H has been measured with high accuracy. Using the concentration dependence, the ratio of the Larmor frequencies of 55Mn for infinite dilution relative to 2H in pure D2O is given. From this ratio a magnetic moment for 55Mn in the permanganate ion has been derived.

Fourier-Kernresonanzuntersuchungen an 10 B und 11 B in wäßriger Lösung / Fourier Transform NMR Studies of 10 B and 11 B in Aqueous Solutions

1975 ◽  
Vol 30 (8) ◽  
pp. 955-958 ◽  
Author(s):  
B. W. Epperlein ◽  
. Lutz ◽  
A. Schwenk
Keyword(s):  
Fourier Transform ◽  
Aqueous Solutions ◽  
Hyperfine Interaction ◽  
Magnetic Moment ◽  
Ground State ◽  
Magnetic Shielding ◽  
Nmr Studies ◽  
Nmr Method ◽  
Atomic Ground State ◽  
Nmr Signals

Abstract The ratios of the Larmor frequencies of 10 B and 2 H and of 11 B and 10 B have been measured with the NMR method and a magnetic moment has been calculated for 10 B in the B (OH)4- -ion. For this, an investigation of the dependence of the NMR signals of 10 B and 2 H on the concentration of some boron salts in solutions of H2O and D2O was necessary. Using hyperfine interaction constants from literature, the hyperfine structure anomaly 10 ∆ 11 of boron in the 2 P1/2 atomic ground state has been calculated. A difference in the magnetic shielding between the isotopes 10 B and 11 B in different compounds could not be detected.

123Te and 125Te Fourier Transform NMR Investigations

1977 ◽  
Vol 32 (11) ◽  
pp. 1263-1265 ◽  
Author(s):  
K. U. Buckler ◽  
J. Kronenbitter ◽  
. Lutz ◽  
A. Nollle
Keyword(s):  
Fourier Transform ◽  
Nuclear Overhauser Effect ◽  
Chemical Shifts ◽  
Magnetic Moments ◽  
Relaxation Times ◽  
Dipole Interaction ◽  
High Accuracy ◽  
Overhauser Effect ◽  
Nuclear Overhauser ◽  
Nmr Signals

Abstract The NMR signals of 123Te and 125Te have been observed in solutions of K2TeO3 and Na2TeO3 in D2O. In these solutions the ratios of Larmor frequencies ν(125Te)/ν(123Te), ν(125Te)/v(2H) and ν(125Te)/ν(23Na) have been determined with high accuracy. With the measured chemical shifts of 2H, 23Na, 125Te relative to infinitely diluted solutions the ratios of the Larmor frequencies are extrapolated and values of the magnetic moments are given. The relaxation times T1 and T2 are very different for 125Te in TeO32-: a ratio T1/T2 of 8.2 ± 0.4 has been found. No nuclear Overhauser effect due to dipole-dipole interaction of 125Te with the water protons has been detected.

High resolution 119Sn nuclear magnetic resonance studies by pulse Fourier transform

1977 ◽  
Vol 55 (6) ◽  
pp. 927-931 ◽  
Author(s):  
C. R. Lassigne ◽  
E. J. Wells
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
High Resolution ◽  
Chemical Shift ◽  
Chemical Shifts ◽  
Relaxation Times ◽  
Spin Rotation ◽  
Tin Compounds ◽  
Magnetic Resonance Studies ◽  
Scalar Contribution

The T1's, linewidths (T2's), and chemical shifts of 119Sn nuclei in a variety of tin compounds have been surveyed using pulse Fourier transform techniques. The results span the very large chemical shift range for tin-119 (∼2000 ppm), and indicate rather short T1 values with widely varied T2 relaxation times. Possible mechanisms are discussed for both T1 and T2 relaxation times. Our results show an approximate correlation between T1 (119Sn) and the paramagnetic contribution to the observed shielding of the 119Sn nucleus, indicating that apart from a large scalar contribution in Sn(IV) iodides and bromides, the dominant 119Sn T1 mechanism is spin rotation interaction.

Fourier Transform NMR Studies of 95Mo and 97Mo

1976 ◽  
Vol 31 (3-4) ◽  
pp. 351-356 ◽  
Author(s):  
W. D. Kautt ◽  
H. Krüger ◽  
O. Lutz ◽  
H. Maier ◽  
A. Nolle
Keyword(s):  
Fourier Transform ◽  
Magnetic Moment ◽  
Chemical Shifts ◽  
Larmor Frequency ◽  
High Accuracy ◽  
Nuclear Magnetic Moment ◽  
Nmr Studies ◽  
Line Widths ◽  
And Shifts ◽  
Nmr Signals

95Mo and 97Mo Fourier transform NMR studies of several alkali molybdate solutions in H2O and D2O are reported. The Larmor frequency of the molybdenum nuclides is remarkably dependent on the solute and the solvent.In potassium molybdate the chemical shifts of 39K were observed. The ratio of the Larmor frequencies of 95Mo and 39K was measured with high accuracy in a 2.6 molal solution of K2MoO4 in H2O. From this value a nuclear magnetic moment of 95Mo and 97Mo in the molybdate ion was derived using the concentration dependencies of the Larmor frequencies of 39K and 95Mo and the ratio of the Larmor frequencies of 97Mo and 95Mo.In solid Ag2MoO4 and metallic molybdenum the 95Mo and 97Mo NMR signals were detected; line widths and shifts are given.

Messung kernmagnetischer Relaxationszeiten in Hochauflösung mittels schneller adiabatischer Passagen

1970 ◽  
Vol 25 (11) ◽  
pp. 1674-1680
Author(s):  
Hans Lütje
Keyword(s):  
High Resolution ◽  
Polyethylene Oxide ◽  
Magnetic Relaxation ◽  
Chemical Shifts ◽  
Signal To Noise Ratio ◽  
Relaxation Times ◽  
Resonance Signal ◽  
Additional Equipment ◽  
Relaxation Measurements ◽  
Fast Passage

Abstract The nuclear magnetic relaxation times T1 and T2 may be determined by observing the relaxation that follows after a stop of an adiabatic fast passage at different points of the resonance signal. High resolution measurements are possible with external proton stabilization during the relaxation process if the chemical shifts are larger than 1 ppm and the relaxation times are longer than 1 sec. If no high resolution is required the lower limit is 0.2 seconds. Relaxation measurements are possible using conventional NMR-spectrometers without additional equipment. Since the signal to noise ratio is favourable, rather dilute solutions may be investigated. Relaxation measurements on benzene, on 4 different protons of 4-dimethylamino-benzaldehyde and on polyethylene oxide in solution are reported.

NOTIZEN: Use of 95Mo NMR for Identification of Molybdenum (VI) Chalcogenide Anions in Aqueous Solution

1977 ◽  
Vol 32 (5) ◽  
pp. 505-506 ◽  
Author(s):  
O. Lutz ◽  
A. Nolle ◽  
P. Kroneck
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Magnetic Resonance ◽  
Aqueous Solutions ◽  
Chemical Shifts ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Abstract95Mo Fourier transform nuclear magnetic resonance studies were made on aqueous solutions of oxo thiomolybdates. Chemical shifts up to 2200 ppm were found for the different unambiguously assigned species MoO4-nSn2- (n = 0, 1, 2, 3, 4).

NUCLEAR SHIELDING PARAMETERS FOR PROTONS IN HYDROGEN BONDS: II. CORRELATION OF CHEMICAL SHIFTS IN INTRAMOLECULAR HYDROGEN BONDS WITH INFRARED STRETCHING FREQUENCIES

1960 ◽  
Vol 38 (8) ◽  
pp. 1249-1254 ◽  
Author(s):  
L. W. Reeves ◽  
E. A. Allan ◽  
K. O. Strømme
Keyword(s):  
Hydrogen Bond ◽  
Chemical Shift ◽  
Hydrogen Bonds ◽  
Infinite Dilution ◽  
Chemical Shifts ◽  
Intramolecular Hydrogen Bonds ◽  
A Value ◽  
Nuclear Shielding ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bonded

Nuclear shielding parameters have been obtained for 24 intramolecularly hydrogen-bonded phenols and naphthols. The shielding parameters are corrected for large diamagnetic anisotropies and a value ΔσOH obtained which represents the change in shielding parameter in parts per million with reference to the infinite dilution chemical shift of phenol, α-naphthol, or β-naphthol. These values of ΔσOH are approximately proportional to the change ΔvOH in the OH stretching frequency on formation of the hydrogen bond.

scholarly journals 11B NMR Investigations of Borate Esters in Aqueous Solutions and Wine

1986 ◽  
Vol 41 (8) ◽  
pp. 1041-1044 ◽  
Author(s):  
O. Lutz ◽  
E. Veil ◽  
U. Brändle ◽  
H. Helber ◽  
E. Kämmerer ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Carboxylic Acids ◽  
Chemical Shifts ◽  
Dilute Solutions ◽  
Nmr Studies ◽  
11B Nmr ◽  
Borate Esters ◽  
Hydroxy Carboxylic Acids ◽  
Nmr Signals

11B NMR studies have been performed in dilute solutions of boric acid resp. borate and some typical hydroxy-carboxylic acids as a function of pH. Typical chemical shifts have been found for the esters occurring at the different ranges of pH. The origin of the two 11B NMR signals observable in wine could be determined.

Donor identification in bulk GaAs by Fourier transform photoluminescence

1991 ◽  
Vol 69 (3-4) ◽  
pp. 427-431 ◽  
Author(s):  
D. J. S. Beckett ◽  
M. K. Nissen ◽  
M. L. W. Thewalt
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
High Purity ◽  
Chemical Shifts ◽  
High Resolution Spectroscopy ◽  
High Signal ◽  
High Magnetic Fields ◽  
Bulk Gaas ◽  
Donor Identification ◽  
Small Chemical

The identification of substitutional shallow donors in GaAs by optical techniques has been problematic because of the extremely small chemical shifts of these effective-masslike impurities. Photoluminescence has been successfully applied in identifying donors in high-purity epitaxial material through the painstaking use of high-resolution spectroscopy, high-magnetic fields, and resonant excitation. Relatively little work has been done in bulk GaAs, where the broadened transitions hinder the resolution of different species. Recently we demonstrated that the high resolution and high-signal throughput obtained with Fourier transform photoluminescence (FTPL) gives superior results for epitaxial material. In this report we show that the advantages of FTPL can also be applied to reliable donor identification in bulk GaAs.

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