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Light Harvesting and Energy Transfer in a Porphyrin-based Metal Organic Framework

Abstract

We present synthesis and photophysical characterization of a water stable PCN-223 MOF constructed from meso-tetrakis(4-carboxyphenyl)porphyrin. Photophysical properties of the synthesized crystalline material were studied by using a wide range of steady-state and time-resolved spectroscopic techniques. Quenching experiments performed on TCPP and PCN-223 demonstrated that the extent and the rate of quenching in MOF is significantly higher than monomeric ligand. Based on these results, we propose that upon photo-excitation, the excitation energy migrates across neutral TCPP linkers until it is quenched by a N-protonated TCPP linker. The N-protonated linkers act as trap states that deactivate the excited state to the ground state. Variable temperature measurements aided in understanding the mechanism of singlet-singlet energy transfer in PCN-223 MOF. The rate of energy transfer and the total exciton hopping distance in PCN-223 were calculated to quantify the energy transfer characteristics of PCN-223. Nanosecond transient absorption spectroscopy was used to study the triplet excited state photophysics in both free ligand and PCN-223 MOF. Efficient energy transfer (Förster radius = 54.5 Å) accompanied with long distance exciton hopping (173 Å) was obtained for PCN-223 MOF.

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Publication details

The article was received on 20 Nov 2018, accepted on 18 Dec 2018 and first published on 18 Dec 2018


Article type: Paper
DOI: 10.1039/C8FD00194D
Citation: Faraday Discuss., 2018, Accepted Manuscript

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    Light Harvesting and Energy Transfer in a Porphyrin-based Metal Organic Framework

    S. Shaikh, A. Chakraborty, J. Alatis, M. Cai, E. O. Danilov and A. J. Morris, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00194D

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