Zhang, Haoke Zheng, Xiaoyan Xie, Ni He, Zikai Liu, Junkai Leung, Nelson L. C. Niu, Yingli Huang, Xuhui Wong, Kam Sing T. K. Kwok, Ryan H. Y. Sung, Herman Williams, Ian D. Qin, Anjun W. Y. Lam, Jacky Tang, Ben Zhong Why Do Simple Molecules with “Isolated” Phenyl Rings Emit Visible Light? π-Bonds connected with aromatic rings were generally believed as the standard structures for constructing highly efficient fluorophores. Materials without these typical structures, however, exhibited only low fluorescence quantum yields and emitted in the ultraviolet spectral region. In this work, three molecules, namely bis­(2,4,5-trimethylphenyl)­methane, 1,1,2,2-tetrakis­(2,4,5-trimethylphenyl)­ethane, and 1,1,2,2-tetraphenylethane, with nonconjugated structures and isolated phenyl rings were synthesized and their photophysical properties were systematically investigated. Interestingly, the emission spectra of these three molecules could be well extended to 600 nm with high solid-state quantum yields of up to 70%. Experimental and theoretical analyses proved that intramolecular through-space conjugation between the “isolated” phenyl rings played an important role for this abnormal phenomenon. Simple Molecules;phenyl rings;600 nm;intramolecular through-space conjugation;π- Bonds;quantum yields;photophysical properties;molecule;emission spectra;nonconjugated structures;fluorescence quantum yields 2017-10-24
    https://acs.figshare.com/articles/dataset/Why_Do_Simple_Molecules_with_Isolated_Phenyl_Rings_Emit_Visible_Light_/5566759
10.1021/jacs.7b08592.s004