Abstract
The weak interactions of 5-imidazolylmethylphenyl-10,15,20-tri-tert-butylphenylporphyrin (1) and 5-imidazolylmethylphenyl-10,15,20-triphenylporphyrin (2) were investigated in chloroform by 1H NMR, UV-Vis and fluorescence spectroscopies, and molecular modeling simulation. The 1H NMR chemical shifts of imidazole in compounds 1 and 2 move upfield compared with that of free imidazole and this shows that intramolecular or intermolecular weak interactions exist in both compounds. Compared with the UV-Vis spectra of compounds 1 and 2 in acetone, their spectra in chloroform show a split Soret band for compound 1, which indicates a weak intramolecular interaction and a red shift of 27 nm for compound 2, which also suggests a weak intermolecular interaction. The fluorescence data supports these results and the data obtained from the molecular simulation are consistent with those of the spectral analyses.
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