Ag(Ⅰ)二噻吩乙烯配合物的合成及光致变色性质研究

摘要

1,2-Bis(2'-methyl-5'- (4"-pyridyl)-3' -thienyl)perfluorocyclopentene (BM4-PTP) is synthesized through bromination using 2-methyl-3,5-dibromothiophene as the starting material and suzuki-coupling followed by reaction with octafluorocyclopentene. The structure is characterized by IR,EA,ESI-MS and NMR. Two Ag(Ⅰ) complexes are prepared by complexation of AgCF3COO and AgC104 with pho-tochromic BM-4-PTP using the diffusion method, respectively, and characterized by IR analysis. The photochromic properties of complexes 1 and 2 are examined in crystalline state by UV spectra. The results indicate that in the case of excitation with appropriate wavelength light, complexes 1 and 2 exhibit reversible photochromic reaction in crystalline state accompanying the color changes between colorless and purple. The effective photochromism of complexes 1 and 2 indicates that the thiophene rings of both complexes adopt antiparallel conformations in crystalline state and that the complexation can not restrict the photochromism based on the cyclization.%以2-甲基-3,5-二溴噻吩为原料通过溴代、suzuki偶合反应与全氟代环戊烯反应合成了1,2-双(2,-甲基-5'-(4”-吡啶基)-3'-噻吩)全氟代环戊烯(BM-4-PTP),以IR,EA,ESI-MS和NMR进行合成产物的结构表征.通过扩散法用AgCF3COO和AgClO4与BM-4-PTP反应合成了两个Ag(Ⅰ)配合物,用红外光谱进行表征.通过紫外光谱法研究了两个配合物在晶体相中的光致变色性质.结果表明:在合适波长的光激发下,伴随着在无色和紫色之间颜色的相互转换,配合物1和2在晶体相显示了可逆的光致变色反应,说明在晶体相两个配合物中的噻吩环均以反平行构型存在,二噻吩乙烯与金属离子的配位并没有阻止晶体相基于环化反应的光致变色性质.