Журнал "Макрогетероциклы"

Mikalai M. Kruk^@ and Aleksander S. Starukhin

B.I. Stepanov Institute of Physics of National Academy of Sciences, Мinsk, 220072, Belarus

Corresponding author E-mail: kruk@imaph.bas-net.by

Spectroscopic properties of monodeprotonated form of cationic 5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin (H₂TMPyP) in solution are studied. Experimental results are interpreted according to Gouterman four-orbital model. Monodeprotonated form HTMPyP^– can be assigned to the D4h symmetry point group, and has spectral and photophysical characteristics similar to that of the fluorescent metal complexes of H₂TMPyP with the relatively low electronegativity of chelated metal ion. The intersystem crossing with the quantum yield ΦISC=0.57 is the main pathway for the excitation energy deactivation of monodeprotonated form HTMPyP^–.