Magnesium Trimethoxyphenylporphyrin Chain Controls Energy Dissipation in the presence of Cholesterol

Abstract

A magnesium porphyrin compound, [Mg(TMPP)(H2O)].(CH3COCH3)2H2O 1 (TMPP = 5,10, 15,20-tetrakis(3,4,5-trimethoxyphenyl)porphyrin) has been synthesized and characterized using single crystal X-ray diffraction and other spectroscopic analysis. The luminescence properties of compound 1 were studied at different concentrations. At higher concentration (3 × 10−3 M), treatment of 1 with cholesterol enhanced the luminescence when excited at Soret band, demonstrating the role of lipid in controlling porphyrin-porphyrin interaction for tuning the bulk photophysical properties. However, at lower concentration (10−5 M) of porphyrin, there was no significant change in luminescence intensity in the presence of cholesterol. It suggests some role of lipids in light harvesting systems where chlorophyll is present at higher concentration. A magnesium porphyrin compound, [Mg(TMPP)(H2O)].(CH3COCH3)2H2O 1 (TMPP = 5,10,15,20-tetrakis(3,4,5-trimethoxyphenyl)porphyrin) was synthesized and structurally characterized using single crystal X-ray diffraction and other spectroscopic analysis. The luminescence properties of compound 1 were studied at different concentrations. At higher concentration (3 x 10-3 M), treatment of compound 1 with cholesterol enhanced fluorescence demonstrating the role of lipid in controlling porphyrin-porphyrin interaction for tuning the bulk photo-physical properties.