Chemical shift and spin-lattice relaxation time for two crystallographically inequivalent 133Cs sites in Cs2BBr4 (B=57Co, 63Cu, and 65Zn) using magic-angle spinning nuclear magnetic resonance

被引：2

作者：

Lim, Ae Ran ^{[1
,2
]}

Kim, Sun Ha ^{[3
,4
]}

机构：

[1] Jeonju Univ, Analyt Lab Adv Ferroelect Crystals, Jeonju 55069, South Korea

[2] Jeonju Univ, Dept Sci Educ, Jeonju 55069, South Korea

[3] Korea Basic Sci Inst, Seoul Western Ctr, Seoul 03759, South Korea

[4] Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea

来源：

SOLID STATE SCIENCES | 2017年 / 67卷

基金：

新加坡国家研究基金会;

关键词：

Cs2CoBr4; Cs2CuBr4; Cs2ZnBr4; Crystal growth; Magic-angle spinning nuclear magnetic; resonance; Spin-lattice relaxation time; SINGLE-CRYSTALS; CS(II);

D O I：

10.1016/j.solidstatesciences.2017.03.013

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structural geometry around the Cs-133 nuclei in Cs2BBr4 (B = Co-57, Cu-63, and Zn-65) 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 T-1 rho of Cs-133 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 Cs2BCI4. The halogen species in Cs2BX4 (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. (C) 2017 Elsevier Masson SAS. All rights reserved.

引用

页码：93 / 98

页数：6