Uniaxial negative thermal expansion facilitated by weak host-guest interactions

被引：50

作者：

Engel, Emile R. ^{[1
]}

Smith, Vincent J. ^{[1
]}

Bezuidenhout, Charl X. ^{[1
]}

Barbour, Leonard J. ^{[1
]}

机构：

[1] Univ Stellenbosch, Dept Chem & Polymer Sci, ZA-7602 Matieland, South Africa

来源：

CHEMICAL COMMUNICATIONS | 2014年 / 50卷 / 32期

基金：

新加坡国家研究基金会;

关键词：

CROWN-ETHER INTERACTIONS; CRYSTAL; COMPLEXES;

D O I：

10.1039/c4cc00849a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A nitromethane solvate of 18-crown-6 was investigated by means of variable-temperature single-crystal X-ray diffraction in response to a report of abnormal unit cell contraction. Exceptionally large positive thermal expansion in two axial directions and negative thermal expansion along the third was confirmed. The underlying mechanism relies exclusively on weak electrostatic interactions to yield a linear thermal expansion coefficient of -129 x 10(-6) K-1, the largest negative value yet observed for an organic inclusion compound.

引用

页码：4238 / 4241

页数：4