Comment on the reference compound for chemical shift and Knight shift determination of Bi-209 nuclei

摘要

Several groups exploring the Bi-209 NMR in solids, including usual insulators, metallic and magnetic materials and recently diamagnetic topological materials, use different standards (usually old and invalid) for chemical shift (Knight shift) determination, ignoring IUPAC recommendations. As a consequence the published shift values exhibit considerable differences (up to 17 500 ppm) (C) 2014 Elsevier Inc. All rights reserved.