乙酸介质中构筑苝酰亚胺染料长纳米线

Construction of Ultralong Nanowires of a Perylene Bisimide Dye in Acetic Acid

合成了一种带酰胺基的苝酰亚胺.紫外-可见光谱表明,该化合物在乙酸和体积分数大于40%的乙酸水溶液中于647nm附近出现'黑相'的特征吸收,苝生色团采取in-phase方式排列;而在乙醇和体积分数小于40%的乙酸水溶液中于571nm附近出现'红相'的特征吸收,苝生色团采取interdigital方式排列.SEM和TEM照片显示,黑色固体的微观形态为长达数百微米,直径为100～200nm的纳米线,而红色固体则为长度为几微米的梭状结构.用紫外-可见和红外光谱监测了随着乙酸浓度的降低和介质改变,固体由黑相到红相的转变,SEM图像还显示,在体积分数为40%的乙酸水溶液中存在长纳米线解体和短的梭状结构形成的转变过程.

A perylene bisimide bearing amide groups was synthesized. In acetic acid, the UV-Vis spectra of the compound displayed a characteristic band at 647 nm, indicating that the molecules aggregated to form ＂black phase＂, in which the perylene chromophores packed in an in-phase mode. The band shifted to 571 nm as ethanol was used as solvent, indicating the formation of ＂red phase＂, in which the chromophores packed in an interdigital mode. SEM and TEM images demonstrat that the morphology of black phase was characterized by nanowires in length of hundreds micrometers and diameter of 100-200 nm; while the morphology of red phase was predominated by shuttle-like microstructures. The black solid changed into red solid in acetic acid aqueous solution with volume fraction of 40% , both the UV-Vis and FTIR spectra monitored the transition from black to red phase, and SEM images demonstrate the decomposition of long nanowires and the formation of short shuttle-like microstructures at such a concentration.