Reaction Of Xanthone Research Articles

Magnetic Field Effects on Photochemical Reaction in Mesoporous Silicates of MCM-41 under High Magnetic Fields up to 5 T

Magnetic field effects (MFEs) on photoinduced hydrogen abstraction reaction of xanthone with xanthene were investigated in 2-propanol confined in mesoporous silicates of MCM-41 under high magnetic fields up to 5 T. The observed MFEs were explained by the spin relaxation mechanism associated with the cage effects on diffusion of the radical pairs in nanopores of MCM-41. The qualitative analysis using the stochastic Liouville equation revealed that the motions of the radical pairs are not restricted in the one dimension, although the MCM-41 used in the present study has the one-dimensional pore with the diameter of 1.7 or 2.7 nm. The effective viscosities for rotation of the solute molecule in the pores were estimated to be 5−10 cP.

A laser flash photolysis study of magnetic field effects on the hydrogen abstraction reaction of xanthone from xanthene in micellar solution

Abstract Excited triplet xanthone abstracts hydrogen from xanthene in sodium dodecyl sulphate micellar solution. The absorption intensity of the generated xanthenyl radicals increases anomalously in the presence of a magnetic field (less than 0.6 T)). The magnetic field effect is interpreted in terms of the radical pair mechanism. This anomaly can be attributed ti bimolecular reaction processes peculiar to micellar solution.