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Photophysical properties of free-base and manganese(III) N-confused porphyrins

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Abstract

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.

Graphical abstract: Photophysical properties of free-base and manganese(iii) N-confused porphyrins

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Publication details

The article was received on 08 Apr 2018, accepted on 04 Jul 2018 and first published on 05 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP02223B
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Photophysical properties of free-base and manganese(III) N-confused porphyrins

    L. Wang, S. Peng, H. Wang, L. Ji and H. Liu, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP02223B

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