Orientational photocontrol of dye molecules assisted by polymer surfaces

在研究水溶性重氮染料在偶氮苯聚合物薄膜上的取向光控过程中，发现二色性染料的浓水溶液显示溶致相。在本财政年度中发现，加入非离子表面活性剂改变了染料溶液的M相，产生了T_<NI>=约50 ℃的织构。X-射线衍射图谱表明，该介相溶液具有两种周期性结构，可能对应于染料分子堆积间距和分子堆积柱间距。当溶致相的水溶液被填充在一个细胞与薄膜的偶氮苯聚合物的膜曝光后，线性偏振光，染料分子的取向方向确定的光化光的电矢量，即使该系统包含超过90%的水，得到稳定的照片图像。此外，还表明，抗哮喘药物DSCG的水溶液的溶致相以相同的方式进行光诱导取向控制。

During the course of studies on the orientational photocontrol of a water-soluble diazo-dye on thin films of azobenzene polymers, it was revealed that concentrated aqueous solutions of the dichroic dye display lyotropic phases. It was found in this fiscal year that the addition of a non-ionic surfactant modifies the M-phase of a dye solution to give rise to a nematic texture with T_<NI>=ca.50ﾟ. X-ray diffraction patterns suggested that the mesophasic solution possesses two periodical structures probably corresponding to the distance between stacked dye molecules and to that between columns consisting of stacked molecules. When the aqueous solution with lyotropic phase was filled in a cell coated with thin films of an azobenzene polymer after exposure of the films to linearly polarized light, the orientational direction of dye molecules was determined by the electric vector of actinic light to give stable photoimages even though the system contains more than 90% of water. It was shown furthermore that a lyotropic phase of an aqueous solution of an anti-asthmatic drug, DSCG,is subjected to photoinduced alignment control in the same way.