Near-infrared-emissive π-conjugated polymers based on five-coordinated silicon formazanate complexes

Near-infrared-emissive π-conjugated polymers based on five-coordinated silicon formazanate complexes
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基于五配位甲氮酸硅配合物的近红外发射π共轭聚合物

DOI:
10.1016/j.polymer.2021.124463
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发表时间:
2022
期刊:
影响因子:
4.6
通讯作者:
Chujo Yoshiki
Chujo Yoshiki
中科院分区:
化学2区
文献类型:
--
作者:
Ito Shunichiro;Ito Yoshinori;Kazuo Tanaka;Chujo Yoshiki

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有机化合物与近红外光的相互作用对于开发下一代功能材料是至关重要的。本论文以N2O2型甲酸甲酸酯为配体,合成了近红外发光的甲酸硅络合物及其共轭聚合物。在计算的几何构型中,硅原子具有方锥结构。有趣的是,配合物的光物理性质受到轴向配体类型的强烈影响。π共轭有效地延伸到聚合物链中,导致前线轨道之间的能量差变窄。旋涂薄膜的发射带达到了近红外II区(>1000 nm)。理论计算表明,配位中心的四方锥体结构是产生高效π共轭的主要原因。
Organic compounds interacting with near-infrared (NIR) light are vital for developing next-generation functional materials. Herein, silicon formazanate complexes and their conjugated polymers with near-infrared luminescence were synthesized using the N2O2-type formazanate ligands. In the calculated geometries, the silicon atom possessed square-pyramidal structures. Interestingly, the photophysical properties of the complexes were strongly affected by the types of axial ligands. π-Conjugation efficiently extended through the polymer chains, resulting in narrow energy gaps between frontier orbitals. The emission band from spin-coat films reached the NIR II region (>1000 nm). Theoretical calculations revealed that the square-pyramidal structure at the coordination center should be responsible for the efficient π-conjugation.
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