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Effects of Donor and Acceptor Units Attached with Benzoselenadiazole: Optoelectronic and Self-Assembling Patterns

机译:苯并硒二唑连接的供体和受体单元的影响:光电和自组装模式

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Here, we report the effects of electron donor and acceptor units attached with benzoselenadiazole for the change in optoelectronic and packing patterns in solid states. We have synthesized 4-methoxybenzene, naphthalene, and 4-nitrobenzene capped benzoselenadiazoles (compounds 1-3 respectively) and studied their photophysical as well as electrochemical properties. All three molecules show two absorption bands (pi-pi transition band and CT-band). Three molecules (1-3) show orange, yellow-green, and green colors in dichloromethane solutions upon irradiation of UV light at 365 nm. Benzoselenadiazole-based compounds 1-2 form head to head dimers via Se center dot center dot center dot N interactions in the solid states. Compounds 1 and 2 show interlock type packing via Se center dot center dot center dot N interaction in their solid state structures. Se center dot center dot center dot pi interaction takes a major role to form interlocked sheet type structures in crystal packing of compound 1, whereas Se center dot center dot center dot N, N center dot center dot center dot N, and CH center dot center dot center dot pi interactions help to form a supramolecular sheet type of structure in the crystal packing of compound 2. Band gaps of these compounds were tuned by changing the electron donating to electron withdrawing units attached with a benzoselenadiazole core.
机译:在这里,我们报告与苯并硒二唑连接的电子供体和受体单元对固态光电和堆积模式变化的影响。我们已经合成了4-甲氧基苯,萘和4-硝基苯封端的苯并硒二唑(分别为化合物1-3),并研究了它们的光物理和电化学性质。所有这三个分子都显示两个吸收带(pi-pi过渡带和CT带)。当在365 nm的紫外线下照射时,三个分子(1-3)在二氯甲烷溶液中显示橙色,黄绿色和绿色。苯并硒二唑基化合物1-2通过固态的Se中心点中心点中心点N相互作用形成头对头二聚体。化合物1和2在其固态结构中通过Se中心点中心点中心点N点相互作用显示出互锁型堆积。 Se中心点中心点中心点pi相互作用在化合物1的晶体堆积中形成互锁的片状结构,而Se中心点中心点中心点N,N中心点中心点中心点N和CH中心点中心点中心点pi相互作用有助于在化合物2的晶体堆积中形成超分子片状结构。通过改变给与苯并硒代二氮唑核相连的吸电子单元的电子供电,可以调节这些化合物的带隙。

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