Improved physical properties and rotational dynamics in a molecular gyroscope with an asymmetric stator structure

被引：29

作者：

Karlen, Steven D. ^{[1
]}

Godinez, Carlos E. ^{[1
]}

Garcia-Garibay, Miguel A. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA

来源：

ORGANIC LETTERS | 2006年 / 8卷 / 16期

关键词：

D O I：

10.1021/ol060894d

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

A molecular gyroscope consisting of a 1,4-diethynylphenylene rotator linked to trityl and triptycyl groups ( 3) showed significantly improved physical properties and faster rotational dynamics than analogous symmetric bis(trityl) ( 1) or bis( triptycyl) ( 2) structures. An activation energy of 7.9 kcal/mol for 3 was determined by H-2 NMR. This is ca. 4-6 kcal/mol lower than that of compound 1. The different dynamics of the three compounds can be qualitatively understood in terms of their different packing coefficients.

引用

页码：3417 / 3420

页数：4

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