β-Octamethoxy-Substituted 22π and 26π Stretched Porphycenes: Synthesis, Characterization, Photodynamics, and Nonlinear Optical Studies
作者:Anup Rana、Sangsu Lee、Dongho Kim、Pradeepta K. Panda
DOI:10.1002/chem.201501299
日期:2015.8.17
aromatic macrocycles, including 22π and 26π acetylene–cumulene bridged stretched octamethoxyporphycenes and octamethoxy[22]porphyrin‐(2.2.2.2), are reported, for the first time, by modification of previously reported synthetic methods. This strategy led to an enhancement in the overall yield of their corresponding octaethyl analogues. The methoxy‐substituted expanded porphycenes display slightly blueshifted
通过修改先前报道的合成方法,首次报道了三个内消旋扩展的四吡咯芳族大环化合物,包括22π和26π乙炔-枯烯桥联的拉伸八甲氧基卟啉和八甲氧基[22]卟啉-(2.2.2.2)。该策略导致其相应的八乙基类似物的总产率提高。相对于其乙基类似物,甲氧基取代的膨胀卟啉显示出轻微的蓝移吸收,并且荧光非常弱,这可能是由于有效的分子内电荷转移(ICT)。此外,还评估了这些大环的双光子吸收(TPA)截面;这些与增加内消旋作用与卟啉芳香性的核心扩展密切相关在大环外围桥接碳原子以及构象柔性和取代效应。尤其是,八甲氧基拉伸的卟啉比八乙基类似物显示出更强的TPA,这是由于26π-八甲氧基乙炔-异丙基卟啉在1700 nm处观察到的最大TPA横截面为830 GM的情况下,甲氧基具有显着的ICT特性。