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13C CP / MAS: Application to glycine - Taylor - 2004 - Concepts in Magnetic Resonance Part A - Wiley Online Library

13C CP / MAS: Application to glycine - Taylor - 2004 - Concepts in Magnetic Resonance Part A - Wiley Online Library

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In a previous article (Concepts Magn Reson 22A (1) 37-49 (2004)), the initial setup of the CP / MAS experiment was described. The advantages of the experiment on direct C 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 CP / MAS experiment is widely applicable, it can not be universally used. The C CP / MAS experiment works at ambient temperature for both the α and γ 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 T1ρ at low temperatures. This shortened T1ρ results from the hindered rotation of the -NH3 group. The technique even fails at ambient temperature for β-glycine. Again, the reason is shortened H T1ρ. © 2004 Wiley Periodicals, Inc. Concepts Magn Reson Part A 22A: 79-89, 2004

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