Synthesis, Structure, and Electropolymerization of 3,4-Dimethoxytellurophene: Comparison with Selenium Analogue

3,4-Dimethoxytellurophene (5) was synthesized via a new ring construction reaction. The crystal structure of 5 is characterized by unusually short Te···Te distances. The electropolymerization of 5 probably produces some amount of poly-5. Since the product was unstable under experimental conditions, a definitive assignment could not be made. However, the UV−vis spectrum recoded during electropolymerization of 5 shows an absorption peak at 679 nm with an onset at 820 nm (1.51 eV), closely matching the calculated band gap of poly-5.

3,4-二甲氧基碲吩(3,4-Dimethoxytellurophene，化合物5)通过新型环构建反应合成得到。该化合物的晶体结构以异常短的碲-碲(Te···Te)间距为显著特征。化合物5的电化学聚合过程可能生成一定量的聚-5(poly-5)。由于该产物在实验条件下不稳定，因此无法对其作出明确的结构指认。不过，在化合物5电化学聚合期间记录的紫外-可见(UV−vis)光谱显示，其在679 nm处存在吸收峰，吸收起始波长为820 nm（对应能量1.51 eV），该结果与聚-5的计算能带隙高度吻合。