Skip to main content
eScholarship
Open Access Publications from the University of California

C-13 CP/MAS: Application to glycine

  • Author(s): Taylor, Robert E
  • et al.
Abstract

In a previous article (Concepts Magn Reson 22A(1) 37-49 (2004)), the initial setup of the C-13 CP/MAS experiment was described. The advantages of the experiment over direct C-13 excitation were also given. In this article, the experiment is applied to three polymorphic structures of glycine. Temperature calibration of the experiment to investigate molecular dynamics as a function of temperature is also described. Though the C-13 CP/MAS experiment is widely applicable, it cannot be universally used. The C-13 CP/MAS experiment works at ambient temperature for both the alpha and gamma polymorphic structures of glycine. However, the cross-polarization technique fails to provide a signal at low temperature from either polymorph. The failure of the technique for both polymorphs arises from the shortened H-1 T-1rho at low temperatures. This shortened T-1rho results from the hindered rotation of the -NH3 group. The technique even fails at ambient temperature for beta-glycine. Again, the reason is a shortened H-1 T-1rho. (C) 2004 Wiley Periodicals, Inc.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View