133Cs sites in Cs2 BBr4 (B=57Co, 63Cu, and 65Zn) using magic-angle spinning nuclear magnetic resonance]]>

摘要

Abstract The structural geometry around the 133Cs nuclei in Cs2 BBr4 (B?=?57Co, 63Cu, and 65Zn) was investigated by examining the chemical shifts and spin–lattice relaxation times in a rotating frame. Two crystallographically inequivalent Cs(1) and Cs(2) sites were differentiated. The spin–lattice relaxation times T1ρ of 133Cs nuclei in three crystals were measured to obtain detailed information about their structural dynamics. Cs(1) surrounded by eleven bromide ions was found to have a longer relaxation time than Cs(2) surrounded by nine bromide ions. The nuclear magnetic resonance (NMR) results were compared to previously reported results for Cs2 BCl4. The halogen species in Cs2 BX 4 (X?=?Br, Cl) was not found to influence the relaxation time, whereas the B metal ion (B?= Co, Cu, and Zn) was found to alter the relaxation time mechanism. Graphical abstract Display Omitted Highlights ? structural geometry around the 133Cs nuclei. ? chemical shifts and spin–lattice relaxation times. ? crystallographically inequivalent Cs(1) and Cs(2) sites. ]]>