Magnesium Trimethoxyphenylporphyrin Chain Controls Energy Dissipation in the presence of Cholesterol

Abstract

A magnesium porphyrin compound, [Mg(TMPP)(H 2 O)].(CH 3 COCH 3)2H 2 O 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.

Influence of position of methoxy groups in Zn-methoxyphenylporphyrins

“…38 The luminescence properties of magnesium analogue of compound 3 is known. 39 The thermal studies of several porphyrins are known. 40,41 We have performed the differential scanning calorimetric studies for the compound l at a scan rate of 5 • C/min up to 250 • C. At that rate, the compound 1 showed one weak endothermic peak at onset temperature 136 • C ( Figure S6, Supplementary Information).…”