title: High solid-state luminescence in propeller-shaped AIE-active pyridine-ketoiminate-boron complexes.
abstract: Two pyridine-ketoiminate-based organoboron complexes (2 and 3) were developed. 2 and 3 showed very weak emission in low-viscosity organic solvents because of the intramolecular rotation induced non-radiative process. Their emission can be dramatically enhanced by the increase in solvent viscosity or by molecular aggregation in the solid state. Moreover, 2 and 3 exhibited intense emission with high quantum yield of 0.53 and 0.46, respectively. X-ray crystallographic analysis showed that the weak intermolecular interactions such as C-H···F and C-H···π by fixing the molecular conformations of 2 and 3 were responsible for intense luminescence in the solid state. The large Stokes shifts and high efficient solid-state emission of 2 and 3 make them valuable AIE luminophores for further potential applications in the fields of fluorescence imaging and materials science.
authors.affiliation: Institute of Functional Organic Molecules and Materials, School of Chemistry and Chemical Engineering, Liaocheng University, No. 1 Hunan Road, Liaocheng, 252000, People's Republic of China. chliuzp@163.com wangxiaoqing@lcu.edu.cn.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wu
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Li
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Liu
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Yan
authors.forename: Shuwen
authors.initials: S
authors.lastname: Gong
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Liu
authors.forename: Weijiang
authors.initials: W
authors.lastname: He
mesh_terms: D001896:Boron Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005456:Fluorescent Dyes / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D014783:Viscosity
chemical_list: D001896:Boron Compounds; D005456:Fluorescent Dyes; D007097:Imines; D011725:Pyridines; D012997:Solvents; C023666:pyridine