Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles

Manas R. Parida; Shawkat Mohammede Aly; Erkki Alarousu; Omar F. Mohammed

doi:10.1021/jp511740t

Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles

Manas R. Parida, Shawkat Mohammede Aly, Erkki Alarousu, Omar F. Mohammed

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.

Original language	English (US)
Pages (from-to)	2614-2621
Number of pages	8
Journal	The Journal of Physical Chemistry C
Volume	119
Issue number	5
DOIs	https://doi.org/10.1021/jp511740t
State	Published - Jan 12 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: S.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corp. (SABIC). The work reported here was supported by King Abdullah University of Science and Technology.

ASJC Scopus subject areas

Surfaces, Coatings and Films
General Energy
Physical and Theoretical Chemistry
Electronic, Optical and Magnetic Materials

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title = "Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles",

abstract = "We investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.",

author = "Parida, {Manas R.} and Aly, {Shawkat Mohammede} and Erkki Alarousu and Mohammed, {Omar F.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: S.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corp. (SABIC). The work reported here was supported by King Abdullah University of Science and Technology.",

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doi = "10.1021/jp511740t",

language = "English (US)",

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AU - Parida, Manas R.

AU - Aly, Shawkat Mohammede

AU - Alarousu, Erkki

AU - Mohammed, Omar F.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: S.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corp. (SABIC). The work reported here was supported by King Abdullah University of Science and Technology.

PY - 2015/1/12

Y1 - 2015/1/12

N2 - We investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.

AB - We investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.

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DO - 10.1021/jp511740t

M3 - Article

SN - 1932-7447

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JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

IS - 5

ER -

Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles

Abstract

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ASJC Scopus subject areas

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