NQR, NMR and crystal structure studies of [C(NH2)3]3Sb2Br9

被引：5

作者：

Terao, H ^{[1
]}

Furukawa, Y

Miki, S

Tajima, F

Hashimoto, M

机构：

[1] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan

[2] Hiroshima Univ, Grad Sch Educ, Higashihiroshima 7398524, Japan

[3] Kobe Univ, Dept Chem, Fac Sci, Nada Ku, Kobe, Hyogo 6578501, Japan

来源：

HYPERFINE INTERACTIONS | 2004年 / 159卷 / 1-4期

关键词：

Br-81; NQR; C(NH2)(3)](3)Sb2Br9; crystal structure; H-1; NMR; T-1; molecular motion;

D O I：

10.1007/s10751-005-9099-y

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The crystal structure of [C(NH2)(3)](3)Sb2Br9 was determined at 143 K: monoclinic, space group C2/c, Z=4, a=15.695 (3), b=9.039(2), c=18.364(3) angstrom, beta=96.94(1)degrees. The structure consists of two crystallographically independent guanidinium ions and two-dimensional corrugated sheets of (Sb2Br93-) in which SbBr6 octahedra are connected through three bridging Br atoms each other. One of the cations situates in a cavity of the (Sb2Br93-)(n) layer with statistical disorder, while the other situates between the layers without disorder. Three Br-81 NQR resonance lines were assignable to terminal Br atoms, while only one line was found for two inequivalent bridging Br atoms. All the Br-81 NQR resonance lines Were subjected to fade-out at low temperatures. The temperature dependence curve of 1(H) NMR T-1 showed well defined two minima, which were explained by postulating the C-3 reorientations of two types of cations with very different activation energies. The DTA (DSC) measurement revealed a phase transition of a first-order type at 444 K.

引用

页码：211 / 216

页数：6

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