Xie, Qiujian; Yang, Yumin; Zhang, Weijie; Gao, Zhu; Li, Xiaofeng; Tang, Juntao; Pan, Chunyue; Yu, Guipeng published their research in Chemical Science in 2021. The article was titled ãPolarization-induced charge separation in conjugated microporous polymers for efficient visible light-driven C-3 selenocyanation of indolesã?Category: pyridine-derivatives The article contains the following contents:
Conjugated microporous polymers (CMPs) were cost-effective photocatalysts in organic transformations, while they were usually limited by the insufficient separation of photogenerated charges. A polarization strategy through mol. geometry optimization to promote the charge separation of CMPs was reported. Three CMP photocatalysts with an alternative donor-acceptor skeleton and tunable symmetry were synthesized by the oxidative coupling of bis-carbazoles with electron-deficient bridges (benzene/pyridine/pyrimidine). Simply regulating the polarization of the starting monomers lead to tailorable porosity, photoelec. properties and photocatalytic activity of the CMPs. They exhibited high efficiency in C-3 selenocyanation of indoles to afford selenocyanatoindoles I [R = H, 5-F, 6-Br, etc.; R1 = H, Me; R2 = H, Me] under visible-light and at room temperature, and pyridine-based CMPs with the largest dipole moment gave a yield of up to 94%, superior to their state-of-the-art photocatalyst counterparts. Photo-phys. experiments combined with theor. calculations further supported that the incorporation of the polarized linker introduced an internal elec. field, benefitted efficient charge separation2,5-Dibromopyridine(cas: 624-28-2Category: pyridine-derivatives) was used in this study.
2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Category: pyridine-derivatives