Characterization of Structure in Biogenic Amorphous Calcium Carbonate: Pair Distribution Function and Nuclear Magnetic Resonance Studies of Lobster Gastrolith

2013 ◽  
Vol 13 (5) ◽  
pp. 1905-1914 ◽  
Author(s):  
Richard J. Reeder ◽  
Yuanzhi Tang ◽  
Millicent P. Schmidt ◽  
Laura M. Kubista ◽  
Diane F. Cowan ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Distribution Function ◽  
Calcium Carbonate ◽  
Magnetic Resonance ◽  
Pair Distribution Function ◽  
Amorphous Calcium Carbonate ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Characterization of vitrinite concentrates. 2. Magic-angle 13C nuclear magnetic resonance studies

Fuel ◽  
1983 ◽  
Vol 62 (1) ◽  
pp. 103-111 ◽  
Author(s):  
P PAINTER ◽  
D KUEHN ◽  
M STARSINIC ◽  
A DAVIS ◽  
J HAVENS ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magic Angle ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

31P and 19F Nuclear Magnetic Resonance Studies of Phosphorus-Fluorine Compounds

1970 ◽  
Vol 25 (11) ◽  
pp. 1199-1214 ◽  
Author(s):  
G. S. Reddy ◽  
R. Schmutzler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coordination Number ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic Resonance Spectra ◽  
Fluorine Compounds ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra (31P, 19F) of a variety of compounds containing phosphorus-fluorine bonds have been studied, in continuation of earlier investigations on the same type of compounds.The previously observed relationship between coordination number of phosphorus and δP was generally confirmed, i. e. δP becomes more positive as the coordination number around phosphorus increases. No meaningful substitution rules, either for chemical shifts or for P-F coupling constants, could be established. The data obtained are discussed qualitatively in relation to the electronegativity of the substituents and to the coordination number of phosphorus. Data on the preparation and characterization of numerous phosphorus-fluorine compounds are also included.

13C nuclear magnetic resonance studies. 85. 13C spectra of several ring-contracted and -expanded steroids

1979 ◽  
Vol 57 (13) ◽  
pp. 1550-1556 ◽  
Author(s):  
Vinod Dave ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Membered Ring ◽  
Magnetic Resonance Studies ◽  
Systematic Examination ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

The 13Cmr spectra of several cholestanes including 13 A-homo-B-nor derivatives, 11 A-homo derivatives, and 8 B-nor examples have been examined. In addition the 13C data for a few of the corresponding androstanes and 16 precursors in the cholestane series are reported. Examples in both the 5α- and 5β-cholestane families were included. These results represent the first systematic examination of the 13C spectra of A-homo-B-nor steroids and should be useful for the characterization of other members in each series. These data also permit some tentative conclusions regarding the favored conformation for the seven-membered ring in the A-homo derivatives.

Sign in / Sign up

Export Citation Format

Share Document