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2D CP/MAS ¹³C Isotropic Chemical Shift Correlation Established by ¹H Spin Diffusion

Author： Wilhelm M. Feng H. Tracht U. Spiess H.W.

Publisher： Academic Press

ISSN： 1090-7807

Source： Journal of Magnetic Resonance, Vol.134, Iss.2, 1998-10, pp. : 255-260

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

A new 2D solid-state CP/MAS ¹³C 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 ¹³C to ¹H and subsequent ¹H spin diffusion. A third cross polarization results in the final ¹³C–¹³C isotropic chemical shift correlation. The ¹H spin diffusion time is a variable parameter allowing different mean square magnetization displacements to be probed. Experimental results on mixtures of differently ¹³C-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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