Magnetic field effect on the photochemistry of chromium complex

ANZANI, ANGEL F.; BAZÁN, CLAUDIA M.; GARCÍA, PABLO F.; BURGOS PACI, MAXI A.; ARGÜELLO, GERARDO A.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

ELSEVIER SCIENCE SA

Año: 2020 vol. 398

1010-6030

he magnetic field effect (MFE) on the emission spectrum, phosphorescence lifetime and quenching by phenols were investigated for the tris(1,10 phenantroline) chromium (III) complex ([Cr(phen)3]3+). The reactions in the present study have been investigated as a function of the field intensity, between 0?8 T at ambient temperature.With the aid of a homemade magnetic field generator, changes in the emission spectrum and lifetime of the (2T/2E) states of [Cr(phen)3]3+ in presence of an external magnetic field were observed. The emission spectrum showed changes in their two phosphorescent states, 2E and 2T1 doublets; a split and a shift, with enhanced emission, of the band located at 700 nm corresponding to the 2T1 → 4A1g transition and an intensity decrease in the band located at 730 nm, corresponding to the 2E → 4A1g transition. The phosphorescent lifetime for both emission states, which is ∼70 μs in aerated aqueous solutions at ambient temperatur