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Enhanced S-2 Fluorescence from a Free-Base Tetraphenylporphyrin Surface-Mounted Metal Organic Framework
Dalian Univ Technol, State Key Lab Fine Chem, Inst Artificial Photosynth, Dalian 116024, Peoples R China..
Dalian Univ Technol, State Key Lab Fine Chem, Inst Artificial Photosynth, Dalian 116024, Peoples R China..
Tech Univ Munich, Chem Dept, D-85747 Garching, Germany..
Tech Univ Munich, Chem Dept, D-85747 Garching, Germany..
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2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 41, p. 23321-23328Article in journal (Refereed) Published
Abstract [en]

The ultrafast transient dynamics of a free-base tetraphenylporphyrin (H2TPP) surface-mounted metal organic framework (SURMOF) is spectroscopically characterized and compared with that of H2TPP in ethanol solution. A dramatic increase of the quantum yield of the Soret band fluorescence (S-2 -> S-0) is observed in the H2TPP-SURMOF, which is accompanied by an increase of the S-2 fluorescence lifetime and a broadening of the fluorescence spectra. In contrast, the Q band (S-1) fluorescence is strongly quenched in the H2TPP SURMOF compared with the fluorescence of H(2)TPPin ethanol solution. The observed transient absorption kinetics supports the fluorescence data. The enhanced fluorescence in the SURMOF compared with H2TPP in solution is attributed to the combination of two factors: the alignment of the vibrational energy levels of the dominant Franck-Condon active mode of the Soret and Q bands and the weaker coupling of these modes to the environment.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 122, no 41, p. 23321-23328
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-238535DOI: 10.1021/acs.jpcc.8b06836ISI: 000448087900009Scopus ID: 2-s2.0-85054667483OAI: oai:DiVA.org:kth-238535DiVA, id: diva2:1260982
Note

QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2020-03-09Bibliographically approved

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