Protonated tetraphenylporphine(H2TPP) J-aggregates were prepared by aggregation on the liquid-air interface. Using FTIR spectroscopy, the authors observed the infrared absorption spectra of H2TPP and its J-aggregates. The IR spectra of H2TPP J-aggregates show significant changes compared with that of H2TPP monomer. Intensity changes(e.g., strong enhancement of the in-plane vibronic mode and weakening of the out-of-plane vibronic mode of phenyl and porphyrin skeletal) were interpreted on the basis of stacking effects. Observation of the same type of bands collapse into single band was explained by the increase in the symmetry of H2TPP molecules. And the new bands at 1635 and 3407 cm-1 indicate the aggregates containing a large amount of bound water.
测量了1,1,3,3-四甲基脲(TMU)在20种不同溶剂中的拉曼光谱,研究了TMU与溶剂之间的相互作用。将TMU羰基的拉曼频移分别与Kirkwood-Bauer-Magat(KBM)参数(ε-1)/(2ε+1)、溶剂受体数(acceptor number,AN)和线性溶剂自由能关系(linear solvation energy relationships,LSER)进行相关分析。结果表明,TMU的CO键振动频移与KBM参数没有很好的线性关系,和受体数之间存在比较好的相关性,与LSER参数的线性关系最好。按受体数把溶剂分为质子性溶剂和非质子性溶剂,分别和羰基频移有好的相关性。通过对LSER参数的分析,可以很好地解释溶质和溶剂间的相互作用。
