Key Lab of Colloid and Interface Chemistry, Ministry of Education of China, Department of Chemistry, Shandong University, Jinan 250100, China.
J Colloid Interface Sci. 2012 Jan 1;365(1):172-7. doi: 10.1016/j.jcis.2011.09.036. Epub 2011 Sep 24.
Three perylenetetracarboxylic diimide (PDI) dimers linked with a conjugated chain of different lengths have been designed and prepared. The UV-Vis absorption and fluorescence spectra of these three dimers revealed different photophysical properties owing to the different length of the linkage. The intermolecular π-π interactions were found to be enhanced significantly with the increase in the length of the linkage and therefore induced different aggregation behaviors of these molecules. The structure of the molecular aggregates was investigated by X-ray diffraction (XRD), and the morphology of the aggregates was examined by atomic force microscopy (AFM). One-dimensional fibers were observed for the aggregates of compounds 2 and 3, and thin solid films were observed for the aggregates of compound 1.
三种联苯四羧酸二酰亚胺（PDI）二聚体通过不同长度的共轭链连接起来，已经被设计和制备。这三种二聚体的紫外可见吸收光谱和荧光光谱由于连接链的不同长度而显示出不同的光物理性质。随着连接链长度的增加，分子间的π-π相互作用显著增强，从而导致这些分子的不同聚集行为。通过 X 射线衍射（XRD）研究了分子聚集体的结构，并通过原子力显微镜（AFM）研究了聚集体的形态。化合物 2 和 3 的聚集体呈现出一维纤维状，而化合物 1 的聚集体则呈现出薄的固态薄膜状。
