| Abstrakt: |
The effect of the chemical structure of porphyrins on the energy of formation of floating layers and their stability in compression–decompression cycles was studied. The compression isotherms of 5,10,15,20-tetra-phenylporphyrin (I), 2-aza-21-carba-5,10,15,20-tetraphenylporphyrin (II), and 5,15-bis(2,6-bis(dodecyl-oxy)phenyl)porphyrin (III), including in three successive compression–decompression cycles, were obtained and analyzed. Modification of the chemical structure of the studied chromophores, leading to an increase in the dipole moment of the macrocycle, can significantly affect the energy of formation of floating layers, which is manifested in a multiple difference in this quantity and compressibility of porphyrin II compared to I and III. Porphyrins I and II, where the phenyl rings act as substituents, aggregate before the floating layer begins to be compressed, while the presence of long aliphatic substituents in the phenyl fragments (of porphyrin III) hinders the aggregation processes. [ABSTRACT FROM AUTHOR] |
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