Unusual symmetry effect on hexa-peri-hexabenzocoronene

被引：22

作者：

Feng, Xinliang ^{[1
]}

Pisula, Wojciech ^{[1
]}

Ai, Min ^{[2
]}

Groeper, Susie ^{[2
]}

Rabe, Juergen P. ^{[2
]}

Muellen, Klaus ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[2] Humboldt Univ, Inst Phys Phys Macromol, D-12489 Berlin, Germany

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 04期

关键词：

D O I：

10.1021/cm702592q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Unusual symmetry effect on the isotropization temperature of two Hexa-peri-hexabenzocoronene (HBC) derivatives is presented. Reduction of the number of substituents and maintaining a high substitution symmetry of the disk-shaped building blocks influence their thermal and self-assembly behavior. Both compounds were soluble in hot toluene and were purified by columnar chromatography and precipitation from methanol. Further characterization by verification of the purity of the compounds were done by nuclear magnetic resonance (NMR) spectroscopy, MALDI-TOF mass spectroscopy, and elemental analysis. Scanning tunneling microscopy (STM) experiments reflected the significant effect of the substitution symmetry on the self-organized monolayer between highly oriented pyrolytic graphite (HOPG) and solution by displaying novel zigzag and flower-like patterns.

引用

收藏

页码：1191 / 1193

页数：3

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