Synthesis and characterization of molecular devices based on photochromic 1,2-dithienylcyclopentene compounds

光致变色内酯和环碳酸酯单体将分别由功能内酯或功能环碳酸酯和1,2-二噻吩环戊烯化合物合成。这些单体随后将通过开环聚合（ROP）聚合得到均聚物，即聚酯或聚碳酸酯，具有高浓度的下垂光致变色单元，具有明确的分子量和低多分散性。利用紫外-可见光谱（光致变色）或电化学循环伏安法（电致变色）研究1,2-二乙烯基环戊烯单元的开环/闭环反应。此外，将制备光致变色双（碳酸）s，并与二胺进行步长反应聚合，得到主链光致变色聚氨酯。最后，将合成具有n -杂环的光致变色1,2-二噻吩环戊烯衍生物，并通过微量热法、紫外-可见光谱法和x射线分析等手段研究其宿主金属离子的能力，即门控光致变色体系的发展。

Photochromic lactone and cyclic carbonate monomers will be synthesized from functional lactones or functional cyclic carbonates, respectively, and 1,2-dithienylcyclopentene compounds. The monomers will subsequently be polymerized by ring-opening polymerization (ROP) to obtain homopolymers, i.e., polyesters or polycarbonates, with a high concentration of pendant photochromic units and with a well-defined molecular weight and a low polydispersity. The ring-opening/ring-closing reaction of the 1,2-dithienylcyclopentene units will be studied by means of UV-vis spectroscopy (photochromism) or electrochemical cyclic voltammetry (electrochromism). Furthermore, photochromic bis(carbonate)s will be prepared and polymerized in a step-growth reaction with diamines to yield main-chain photochromic polyurethanes. Finally, photochromic 1,2-dithienylcyclopentene derivatives with N-Heterocycles will be synthesized, and their ability to host metal ions, i.e., the development of gated-photochromic systems, will be studied for example by means of microcalorimetry, UV-vis spectroscopy, and X-ray analysis.