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2D CP/MAS13C Isotropic Chemical Shift Correlation Established by1H Spin Diffusion

✍ Scribed by M. Wilhelm; H. Feng; U. Tracht; H.W. Spiess

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 89 KB
Volume: 134
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1512

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✦ Synopsis

A new 2D solid-state CP/MAS 13 C NMR exchange experiment for through-space isotropic chemical shift correlation is proposed and demonstrated. Through-space correlation is established via a second cross polarization from 13 C to 1 H and subsequent 1 H spin diffusion. A third cross polarization results in the final 13 C-13 C isotropic chemical shift correlation. The 1 H spin diffusion time is a variable parameter allowing different mean square magnetization displacements to be probed. Experimental results on mixtures of differently 13 C-labeled alanine and polyethylene indicate that this site-selective 2D technique can be used to characterize domain sizes and proximities over a wide range of length scales (1-200 nm) in solids such as polymers or biological materials.

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