Abstract Two nonsymmetrical π-extended 2,1,3-benzothiadiazoles (BTDs) bearing a 4-pyridyl moiety (BTD-4pyr and BTD-Et4pyr) were synthesized by sequential cross coupling reactions. The structural difference between the two dyes is the presence of a triple bond between the BTD core and the 4-pyridyl moiety in BTD-Et4pyr. The compounds architecture is similar to previously described selective mitochondrial
摘要 通过顺序交叉偶联反应合成了两种带有 4-
吡啶基部分的非对称 π-扩展
2,1,3-苯并噻二唑 (BTDs)(BTD-4pyr 和 BTD-Et4pyr)。两种
染料之间的结构差异在于 BTD 核心和 BTD-Et4pyr 中的 4-
吡啶基部分之间存在三键。化合物结构类似于先前描述的选择性线粒体
生物标志物。这两种化合物都表现出较大的斯托克斯位移 (93–137 nm)、高荧光量子产率和纳摩尔范围内的线性荧光响应。三键的存在使从 BTD-Et4pyr 测量的荧光相对于 BTD-4pyr 降低了约 35%。测量
染料的固态荧光,产生比在溶液中观察到的更小的斯托克斯位移(BTD-4pyr 为 74 nm,BTD-Et4pyr 为 66 nm)。BTD-4pyr 的 X 射线晶体学分析表明 BTD 环具有醌型特征,并且 BTD 核与芳基/杂芳基之间存在非平面关系。DFT 计算指出 LUMO 电子密度集中在