Photophysical properties of free-base and manganese(iii) N-confused porphyrins
| Autor: | Hai-Yang Liu, Li-Li Wang, Su-Hong Peng, Hui Wang, Liang-Nian Ji |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
General Physics and Astronomy chemistry.chemical_element Free base Manganese 010402 general chemistry Photochemistry Internal conversion (chemistry) 01 natural sciences Porphyrin Fluorescence 0104 chemical sciences Metal chemistry.chemical_compound Intersystem crossing chemistry visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry |
| Zdroj: | Physical chemistry chemical physics : PCCP. 20(30) |
| ISSN: | 1463-9084 |
| Popis: | The photophysical properties of N-confused 5,10,15,20-tetraphenyl porphyrin derivatives have been studied using steady-state and time-resolved spectroscopic techniques. The peripherally substituted N-confused 5,10,15,20-tetraphenyl free-base porphyrins (NCTPPs) show stronger B-band absorptions in DCM than in DMAc, while much stronger emissions have been observed in DMAc, which may be due to the shorter times (τIC) of internal conversion from the B-band to the Q-band. The Q-band spectral structures of NCTPPs in DCM are significantly different from those in DMAc. The introduction of ortho-OCH3 results in the strongest emission in both DCM and DMAc and significant fluorescence after N-methylation even though the emissions of other N-methyl complexes are quenched. The N-methylation of NCTPPs leads to a larger τIC and shorter emission lifetime. The excited-state dynamics of manganese(iii) N-confused porphyrins (Mn(Cl)NCH3NCTPPs) are influenced by both peripheral substituents and manganese(iii) metal ion, and exhibit ultrafast intersystem crossing processes. |
| Databáze: | OpenAIRE |
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