Pyrrole → meso-Tetra(4-carboxyphenyl)porphine

Participants

Reaction Steps

In refluxed propionic acid, 30 g of 4-carboxybenzaldehyde was reacted with 13.4 g of pyrrole to obtain 6.9 g of 5,10,15,20-tetra(4-carboxyphenyl)porphine. In a mixed solvent of 200 ml ofdistilled water and 300 ml of methanol was dissolved 10 g of polyvinyl alcohol having a polymerization degree of 2,000 and a saponification degree of 100%, and 0.066 g of the so-synthesized 5,10,15,20-tetra(4-carboxyphenyl)porphine was added to the solution. The solution was dried in a Petri dish to obtain a film having a guest concentration of 10-2M and a thickness of 0.5 mm. The sample was cooled to the liquid helium temperature and irradiated with a laser beam having a wavelength of 645 nm and an intensity of 1 mW/cm2 for 30 seconds to form a PHB hole. Then, the temperature of the film was elevatedto a predetermined level, the film was again cooled to the liquid helium temperature, and the half width of the PHB hole was measured.

Provenance & Evidence