Synthesis and Photophysical Properties of Phenyleneethynylenes Containing a Combination of Two Main Group Element Moieties of B, Si, or P on the Side Chain
作者:Takanobu Sanji、Akemi Fuchigami、Masato Tanaka
DOI:10.1021/acs.organomet.7b00768
日期:2018.2.12
molecules showed the molecules have two-dimensional conjugation systems, i.e., the π-conjugation of the original π-conjugation backbone and p(B)π–π* conjugation of B, σ*−π* conjugation of Si, and n−π and σ*−π* conjugation of P, extended from the π-core. The highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) energy levels are significantly altered because of a lowering
合成了包含B,Si或P的两个主族元素部分的组合作为侧链一部分的X形1,4-亚苯基亚乙炔基。2-溴-5-二甲基苯基甲硅烷基-1,4-双(苯基乙炔基)苯的卤素-锂交换,然后添加氟代二甲基异戊烷或氯代二苯基膦,分别得到“ X形” B / Si和Si / P。含P的分子被氧化以提供P(= O)衍生物。通过3个步骤将B / PO部分引入1,4-亚苯基亚乙炔基单元,即2,5-二溴-1,4-双(三甲基甲硅烷基乙炔基)苯的卤素-锂交换,然后依次添加氟代二甲基三茂硼烷和氯代二苯基膦氧化,去甲硅烷基化和Sonogashira与芳基碘化物偶联。然后,B / PO的还原得到“ X形” B / P衍生物。“ X形”分子的吸收和荧光光谱表明,该分子具有二维共轭体系,即原始π共轭骨架的π共轭和B(σ)的p(B)π–π *共轭Si的*-π*共轭,P的n-π和σ*-π*共轭,从π核扩展。由于B的p-π*共轭和Si和P的σ*