溶剂对TCNQ的红外和紫外-可见吸收光谱的影响

测量了7,7,8,8-四氰基对苯醌二甲烷(TCNQ)在5种溶剂中的红外和紫外-可见吸收光谱,用分子间相互作用的理论模型进行了分析,并通过建立LSER方程验证了频率变化是由于给体和受体配合所致.结果表明:TCNQ氰基的伸缩振动频率随溶剂电子受体数的增加而发生红移;吸收频率随溶剂极性参数ET(30)和ENT的增加而发生蓝移,并且ETN参数比ET(30)能更好地描述TCNQ的溶剂极性.

Effect of Solvent on Infrared Spectra and UV-Visible Spectra of the TCNQ

The solvent effects on the C(=)N stretching vibration frequency of TCNQ were investigated by means of the infrared spectra and analysed by several theoretical models of the molecular interaction. The results indicate that the frequency of the C(=)N of TCNQ increased with the solvent receptor decreased. The LSER equation was a good explanation using the AN-DN model, which confirmed the frequency change was due to the receptor complex rather than the hydrogen bond. The UV-visible absorption spectra of TCNQ in different solvents exhibited the blue shift of its absorption peak with the increases of solvent polarity parameters E_N~T and E_T(30), and comparing the curves of the two polar solvents parameters E_T(30) and E_N~T confirmed E_N~T is better than E_T(30) in describing the solvent polarity of TCNQ.