scholarly journals Sign determination of dipolar couplings in liquid crystals by off-magic-angle sample spinning

2021 ◽  
Vol 781 ◽  
pp. 138997
Author(s):  
Debashis Majhi ◽  
Boris B. Kharkov ◽  
Sergey V. Dvinskikh
Keyword(s):  
Liquid Crystals ◽  
Dipolar Couplings ◽  
Magic Angle ◽  
Magic Angle Sample Spinning ◽  
Sign Determination

Solid state n.m.r. of biopolymers

1981 ◽  
Vol 299 (1452) ◽  
pp. 665-683 ◽  
Keyword(s):  
Amino Acids ◽  
Solid State ◽  
High Resolution ◽  
Angular Dependence ◽  
Dipolar Couplings ◽  
Magic Angle ◽  
Biological Applications ◽  
Crystal Forms ◽  
Magic Angle Sample Spinning

Some aspects of high-resolution 13 C n.m .r. of solid biopolymers are described. Spectra of amino acids, peptides, proteins and DNA are shown. Differences between solution spectra and solid state spectra of a molecule include multiple lines due to multiple crystal forms, splittings of substituted rings and asymmetric splittings of carbons bonded to nitrogen. The inability of magic angle sample spinning to remove 13 C - 14 N dipolar couplings is a consequence of the 14 N quadrupole moment’s altering the angular dependence of the interactions. Solid state n.m .r. of filamentous viruses is given as an example of new biological applications of this type of spectroscopy.

A robust pulse sequence for the determination of small homonuclear dipolar couplings in magic-angle spinning NMR

2004 ◽  
Vol 390 (1-3) ◽  
pp. 1-7 ◽  
Author(s):  
Per Eugen Kristiansen ◽  
Marina Carravetta ◽  
Wai Cheu Lai ◽  
Malcolm H. Levitt
Keyword(s):  
Pulse Sequence ◽  
Magic Angle Spinning ◽  
Dipolar Couplings ◽  
Magic Angle ◽  
Angle Spinning
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