Citation: ZHU Qian, CAO Chao-Tun, CAO Chen-Zhong. Extension and Application of Excited-State Constants of meta-Substituents[J]. Acta Physico-Chimica Sinica, ;2017, 33(4): 729-735. doi: 10.3866/PKU.WHXB201611291
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Seven series of 3,4'-disubstituted stilbenes were synthesized, with meta-substituents X (m-XSBYp) including: NO2, I, CHCH2, Ph, Et, NMe2, and CCH (m-XSBY-p). The longest wavelength maximum λmax (nm) in ultraviolet absorption spectra of the compounds were measured. A quantitative correlation analysis was performed in terms of energy, the Vmax (cm-1) for 3,4'-disubstituted stilbenes. The excited-state substituent constants σCC(m)ex of the seven meta-substituents were determined by curve-fitting. The constants σCCex of the metaand para-substituents were compared with their Hammett constants σ. The results indicated that σCCex and σ express the substituent electrostatic effects in the excited-and ground-states, respectively. In addition, 10 samples of aryl Schiff bases and 14 samples of 3,3'-disubstituted stilbenes with meta-substituents X were synthesized, and their λmax,pred. were predicated based on the obtained constants σCC(m)ex. These results showed that the λmax,pred. values agreed well with the experimental values, and confirmed the reliability of the obtained σCC(m)ex values. We also collected Vmax values of 225 samples of disubstituted stilbenes and disubstituted benzenes and established a general quantitative equation to express the change regularity of their Vmax.
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