聚乙二醇支载的螺吡喃类光致变色化合物的合成及其逆光致变色性质

采用DCC缩合的方法,将吲哚啉螺苯并吡喃的衍生物和聚乙二醇相缩合,以聚乙二醇末端的羟基和吲哚啉螺苯并吡喃衍生物的羧基为反应活性基团,实现了带有羧基的螺吡喃类光致变色化合物支载到了聚乙二醇两端.通过引入亲水基团得到了水溶性较好的螺环类光致变色化合物.通过对产物的紫外-可见光谱的研究发现,产物具有良好的光致变色性质,在乙醇、丙酮和乙酸乙酯中皆具有良好的光致生色现象;产物可溶于水,在紫外光(波长365nm)照射时产生了光消色现象,具有明显的逆光致变色性质.该方法原料易得,反应条件容易控制,为光致变色新材料的研究和开发提供了新方法.

Synthesis and Negative Photochromic Properties of Photochromic Spiropyrans Compounds Supported by Polyethylene Glycol

Spirobenzopyrans with carboxylic group were successfully supported by polyethylene glycols in the presence of DCC from the derivatives of indolinospirobenzopyrans and polyethylene glycols. Hydroxyl of polyethylene glycols and carboxylic group in photochromic spirobenzopyrans act as the active groups. Spirobenzopyrans with a good water-solubility were synthesized by introducing hydrophilic groups. Their photochromic properties in solution were investigated by UV-Vis spectroscopy. It is shown that the new compounds had good photochromic properties in ethanol, acetone and ethyl acetate, especially good negative photochromic properties in water under irradiation at 365 nm. The method has advantage of cheap reagents, simple workup procedure. It is of great value for evolution in research studies of new photochromic materials.