In this work,to develop strong near-infrared circularly polarized luminescent(NIR-CPL)emitters,a pair of ytterbium helicates,namely,[Yb_(2)(R-BTHP)_(4)]_(2)−and[Yb_(2)(S-BTHP)_(4)]^(2−),based on binaphthol-modified b...In this work,to develop strong near-infrared circularly polarized luminescent(NIR-CPL)emitters,a pair of ytterbium helicates,namely,[Yb_(2)(R-BTHP)_(4)]_(2)−and[Yb_(2)(S-BTHP)_(4)]^(2−),based on binaphthol-modified bis-β-diketones was synthesized.X-ray crystallography analysis confirms the formation of the homochiral quadruple-stranded dinuclear structure of the helicate.CPL spectroscopy measurements show that the helicates exhibit an exceptionally high luminescence dissymmetry factor(|g_(lum)|)of 0.81 at 980 nm,the highest value reported for Yb-CPL materials,as well as the largest near-infrared circularly polarized luminescence brightness(B_(CPL),821 M^(−1)cm^(−1)).We proposed that the high glum value originates from the rigid and high symmetry of the helical structure,and the perfect eight-coordinated square antiprismatic configuration(8-SAPR)around the Yb^(3+) ion.This work offers an example for the design of chiral CPLemitting lanthanide complexes with large glum values.In view of the 980 nm light localized at the biologically relative NIR emission window,the helicates reported herein show promising applications in biologically relevant sensors and 980 nm fiber lasers.展开更多
基金financially supported by the National Natural Science Foundation of China(no.52273263,52203219,51872077 and 52073080)Science and Technology Plan of Inner Mongolia Autonomous Region(2020GG0164)Scientific Research Project of Basic Scientific Research Operating Expenses of Colleges and Universities in Heilongjiang Province(2021-KYYWF-0029 and 2021-KYYWF-0041).
文摘In this work,to develop strong near-infrared circularly polarized luminescent(NIR-CPL)emitters,a pair of ytterbium helicates,namely,[Yb_(2)(R-BTHP)_(4)]_(2)−and[Yb_(2)(S-BTHP)_(4)]^(2−),based on binaphthol-modified bis-β-diketones was synthesized.X-ray crystallography analysis confirms the formation of the homochiral quadruple-stranded dinuclear structure of the helicate.CPL spectroscopy measurements show that the helicates exhibit an exceptionally high luminescence dissymmetry factor(|g_(lum)|)of 0.81 at 980 nm,the highest value reported for Yb-CPL materials,as well as the largest near-infrared circularly polarized luminescence brightness(B_(CPL),821 M^(−1)cm^(−1)).We proposed that the high glum value originates from the rigid and high symmetry of the helical structure,and the perfect eight-coordinated square antiprismatic configuration(8-SAPR)around the Yb^(3+) ion.This work offers an example for the design of chiral CPLemitting lanthanide complexes with large glum values.In view of the 980 nm light localized at the biologically relative NIR emission window,the helicates reported herein show promising applications in biologically relevant sensors and 980 nm fiber lasers.
