The activation of NH bonds in tetrabenzoporphyrin molecules by electron-donor solvents

It is shown by the chemical kinetics, proton NMR spectrometry, and calorimetry methods that, unlike classic porphyrins, their tetrabenzosubstituted analogues participate in weak acid-base interactions with electron-donor solvents, which results in the activation (delocalization) of NH bonds in their molecules and strengthening of the coordination properties of tetrabenzoporphyrins in such solvents (Py, DMSO, and DEA). The structures of tetrabenzoporphyrins are intermediate between those of classic porphyrins proper and rigid nonclassic porphyrins. Tetrabenzoporphyrins are closer to the latter in their properties.