水杨醛
镱
发光
二酮
化学
光化学
材料科学
高分子化学
立体化学
席夫碱
光电子学
兴奋剂
作者
Bo-Yu Xie,Yuanlin Zhou,Ou Sun,Pengfei Yan,Ting Gao,Hongfeng Li
标识
DOI:10.1016/j.jlumin.2021.118431
摘要
Two near-IR emissive sandwich-type ytterbium complexes [Zn(OAc)(μ- L 1 )Yb(DBM) 2 ] ( 1 ) and [Zn(OAc)(μ- L 2 )Yb(DBM) 2 ] ( 2 ) were designed and synthesized. The sandwich structures were confirmed by single crystal X-ray crystallographic analysis, where one Yb 3+ ion was sandwiched between one L and two DBM ligands ( L 1 and L 2 represents the bis-salicylaldehyde derivatives; DBM = dibenzoylmethane). Photophysical measurements demonstrated the excellent NIR luminescence properties with quantum yields (QYs) reaching to 0.50% and 2.22% for complexes 1 and 2 , respectively. Combining the structure and spectroscopy evidences, it was suggested that the sandwich structure and heavy atom effects contributed to suppress the nonradiative decay rate and improve the intersystem crossing efficiency from singlet to triplet state. The sandwich-type ytterbium(III) complexes [Zn(OAc)(μ- L 1 )Yb(DBM) 2 ] constructed from β-diketone and bis-salicylaldehyde derivatives shows the excellent NIR luminescence properties with quantum yields (QYs) reaching to 2.22%. It was suggested that the sandwich structure and heavy atom effects contributed to suppress the nonradiative decay rate and improve the intersystem crossing efficiency from singlet to triplet state. • Two NIR-emitting heterobinuclear Zn–Ln complexes were synthesized. • The luminescence quantum yields reaching 2.22% for Br substituted complex 1 . • The complexes show a more effective energy transfer in view of synergistic interaction between two ligands.
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