具有共轭自旋的六苯并蒄中存在正向磁-LC 效应。

Positive magneto-LC effect in conjugated spin-bearing hexabenzocoronene.

机构信息

Max Planck Institute for Polymer Research , Ackermannweg-10, D-55128, Mainz, Germany.

出版信息

J Am Chem Soc. 2014 Sep 17;136(37):12860-3. doi: 10.1021/ja507421x. Epub 2014 Sep 8.

Abstract

The first neutral spin carrying hexabenzocoronene (HBC) derivative is described. The conjugated phenyl nitroxide substituted HBC with five alkyl chains exhibits a positive magneto-LC effect in columnar hexagonal liquid crystalline phase as probed by differential scanning calorimetry and electron paramagnetic resonance spectroscopy. Surprisingly, at 140 K the ΔMS = 2 transition can be observed indicating a thermally accessible triplet state between the neighboring molecules in the columnar arrangements.

摘要

首次描述了具有中性自旋的六苯并蒄（HBC）衍生物。带有五个烷基链的共轭苯基氮氧自由基取代的 HBC 在柱状六方液晶相中表现出正磁致 LC 效应，这可通过差示扫描量热法和电子顺磁共振波谱法来探测。令人惊讶的是，在 140 K 时可以观察到ΔMS=2 跃迁，表明在柱状排列的相邻分子之间存在热可及的三重态。