Hexagonal Columnar Porphyrin Assembly by Unique Trimeric Complexation of a Porphyrin Dimer with π−π Stacking: Remarkable Thermal Behavior in a Solid

On heating, syn-diporphyrin zinc complexes fused with bis(ethano)dimethoxyanthracene, the crystal structure of which showed a unique trimeric assembly, extruded one ethylene molecule at 240−310 °C to give a porphyrin-naphthoporphyrin diad, and the second retro-Diels−Alder reaction and concomitant decomposition of the methoxy groups occurred at 280−350 °C to give the anthraquinone-fused diporphyrin, while the first thermal conversion of the anti-diporphyrin zinc complex occurred in a much lower temperature range (180−230 °C)

Hexagonal Columnar Porphyrin Assembly by Unique Trimeric Complexation of a Porphyrin Dimer with π−π Stacking: Remarkable Thermal Behavior in a Solid

On heating, syn-diporphyrin zinc complexes fused with bis(ethano)dimethoxyanthracene, the crystal structure of which showed a unique trimeric assembly, extruded one ethylene molecule at 240−310 °C to give a porphyrin-naphthoporphyrin diad, and the second retro-Diels−Alder reaction and concomitant decomposition of the methoxy groups occurred at 280−350 °C to give the anthraquinone-fused diporphyrin, while the first thermal conversion of the anti-diporphyrin zinc complex occurred in a much lower temperature range (180−230 °C)

UV Protection and Singlet Oxygen Quenching Activity of Aloesaponarin I

The UV protection and singlet oxygen quenching of aloesaponarin I have been studied by means of laser spectroscopy. The excited-state intramolecular proton transfer that provides the UV protection takes place along only one of the molecule's two intramolecular hydrogen bonds, and this can be understood by considering the nodal pattern of the wave function. The functional groups participating in the excited-state intramolecular proton transfer also play important roles in the singlet oxygen quenching. Aloesaponarin I has a quenching rate constant larger than that of vitamin E and has a long duration of action due to its resistance to UV degradation and chemical attacks by singlet oxygen and free radicals

UV Protection and Singlet Oxygen Quenching Activity of Aloesaponarin I

The UV protection and singlet oxygen quenching of aloesaponarin I have been studied by means of laser spectroscopy. The excited-state intramolecular proton transfer that provides the UV protection takes place along only one of the molecule's two intramolecular hydrogen bonds, and this can be understood by considering the nodal pattern of the wave function. The functional groups participating in the excited-state intramolecular proton transfer also play important roles in the singlet oxygen quenching. Aloesaponarin I has a quenching rate constant larger than that of vitamin E and has a long duration of action due to its resistance to UV degradation and chemical attacks by singlet oxygen and free radicals