Isotropic proton-detected local-field nuclear magnetic resonance in solids

Abstract

A new nuclear magnetic resonance (NMR) method is presented which produces linear, isotropic protondetected local-field spectra for I N S spin systems in powdered samples. The method, HETeronuclear Isotropic Evolution (HETIE), refocuses the anisotropic portion of the heteronuclear dipolar coupling frequencies by evolving the system under a series of specially designed Hamiltonians and evolution pathways.The theory behind HETIE is presented along with experimental studies conducted on a powdered sample of ferrocene, demonstrating the methodology outlined in this paper. Applications of HETIE for structural determination in solid-state NMR are discussed.