FitzGerald Simon, Farren Christopher, Stanley Claire F, Beeby Andrew, Bryce Martin R
Chemistry Department, University of Durham, South Road, Durham, UK DH1 3LE.
Photochem Photobiol Sci. 2002 Aug;1(8):581-7. doi: 10.1039/b203109d.
Steady state and time resolved studies of a tetrakis[(+/-)-2,2-dimethyl-1,3-dioxan-4-ylmethanol] (solketal) substituted zinc phthalocyanine (1) and its derivatives (4a-c) are reported. These compounds form novel fluorescent dimers (or higher order aggregates) at low temperature, with a red shifted emission band centred at approximately 750 nm. The degree of aggregation has been related to the nature of the peripheral substituents, with bulky groups reducing and long alkyl chains increasing the phenomenon. Fluorescence lifetimes of the dimeric species are reported. Flash photolysis results show complex behaviour of the transient species, and it is possible to identify three main processes, involving decay of the monomer triplet state, the dimer triplet, and dimer disaggregation, with each process having a characteristic transient lifetime.
报道了四[（±）-2,2-二甲基-1,3-二氧六环-4-基甲醇]（缩酮）取代的锌酞菁（1）及其衍生物（4a - c）的稳态和时间分辨研究。这些化合物在低温下形成新型荧光二聚体（或高阶聚集体），其发射带红移，中心波长约为750 nm。聚集程度与外围取代基的性质有关，体积大的基团会减少聚集现象，而长烷基链会增加这种现象。报道了二聚体物种的荧光寿命。闪光光解结果显示瞬态物种的行为复杂，可以识别出三个主要过程，包括单体三重态的衰减、二聚体三重态和二聚体解聚，每个过程都有特征性的瞬态寿命。
