作者:Arumugasamy Elangovan、Hsing-Hua Chiu、Shu-Wen Yang、Tong-Ing Ho
DOI:10.1039/b410829a
日期:——
Electrogenerated chemiluminescence (ECL) of six new ethyne-based acridine derivatives (1–6) has been studied. The new acridine derivatives were synthesized by cross-coupling of 9-chloroacridine and corresponding donor-substituted phenylethynes under modified Sonogashira conditions. The donor groups were varied in the order of increasing steric hindrance and donor strength at the donor site. The solution phase photophysical properties and ECL of these compounds were studied comparatively in acetonitrile solvent. The UV-Visible spectra of compounds 1–5 exhibit closely the same maxima. Density functional theory (DFT) has been invoked to analyze and understand the unexpected UV-Visible absorption behavior. Compounds with weak electron donors produce excimer ECL irrespective of steric hindrance at the donor site, while the compound with a stronger donor gives rise to ECL that is blue-shifted with respect to its photoluminescence spectrum. All except one of these compounds also exhibit solid state fluorescence which may be useful for solid state devices such as organic light emitting diodes (OLEDs) and as laser dyes. The observed properties are discussed with reference to the structure of the compounds synthesized.
六种新的乙炔基蒽类衍生物(1–6)的电致发光化学发光(ECL)进行了研究。这些新蒽类衍生物通过在改进的Sonogashira条件下,将9-氯蒽与相应的供体取代的苯乙炔进行交叉偶联合成。供体基团的变化顺序为逐渐增加的空间位阻和供体强度。以乙腈溶剂为介质,比较研究了这些化合物的溶液相光物理性质和ECL。化合物1–5的紫外-可见光谱展现出非常接近的最大值。为分析和理解意外的紫外-可见吸收行为,采用了密度泛函理论(DFT)。弱电子供体的化合物产生的外激发体ECL与供体位点的空间位阻无关,而强供体的化合物则在其光致发光光谱上产生蓝移的ECL。这些化合物中除了一个以外,均表现出固态荧光,这可能对固态器件如有机发光二极管(OLEDs)和激光染料非常有用。观察到的性质与合成化合物的结构进行了讨论。