Abstract
A two-dimensional pulse sequence is introduced for correlating nuclear magnetic resonance anisotropic chemical shifts to a relaxation time (e.g., T1) in solids under static conditions. The sequence begins with a preparatory stage for measuring relaxation times, and is followed by a multiple pulse sequence for homonuclear dipolar decoupling. Data analysis involves the use of Fourier transform, followed by a one-dimensional inverse Laplace transform for each frequency index. Experimental results acquired on solid samples demonstrate the general approach, and additional variations involving heteronuclear decoupling and magic angle spinning are discussed.
Highlights
One (1D) and two dimensional (2D) inverse Laplace transforms (ILTs) have facilitated the characterization of exponential decays in a wide range of diffusion or relaxation nuclear magnetic resonance (NMR) experiments [1,2]
In this work we introduce a new methodology for correlating anisotropic chemical shifts to relaxation times in a 2D experiment of static solids
The SME2 sequence is comprised of a train of symmetric magic echo trains that refocus the evolution of the 19F–19F homonuclear dipolar interactions; magnetization is stroboscopically detected at the cycle time of 12τ
Summary
One (1D) and two dimensional (2D) inverse Laplace transforms (ILTs) have facilitated the characterization of exponential decays in a wide range of diffusion or relaxation nuclear magnetic resonance (NMR) experiments [1,2]. A number of different experiments have been reported in the literature that make use of the ILT including exchange [3], relaxation–relaxation [1,4], relaxation–diffusion [5], diffusion–diffusion [6], and chemical shift–diffusion [7] correlation approaches These methods have been successfully applied to probe molecular dynamics and structure, for example via a diffusion coefficient or exchange rate, in many different type of systems such as polymers [8,9], rock [10,11], and biological systems [12,13,14]. The method introduced in that work made use of non-negative least-squares fitting of relaxation data to obtain a 2D mapping of relaxation time (e.g., T1) to chemical shift
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
