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Long-Lived, Charge-Shift States in Heterometallic, Porphyrin-Based Dendrimers Formed via Click Chemistry

Lookup NU author(s): Emeritus Professor Anthony Harriman


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A series of multiporphyrin clusters has been synthesized and characterized in which there exists a logical gradient for either energy or electron transfer between the porphyrins. A central free-base porphyrin (FbP), for example, is equipped with peripheral zinc(II) porphyrins (ZnP) which act as ancillary light harvesters and transfer excitation energy to the FbP under visible light illumination. Additional energy-transfer steps occur at the triplet level, and the series is expanded by including magnesium(II) porphyrins and/or tin(IV) porphyrins as chromophores. Light-induced electron transfer is made possible by incorporating a gold(III) porphyrin (AuP+) into the array. Although interesting by themselves, these clusters serve as control compounds by which to understand the photophysical processes occurring within a three-stage dendrimer comprising an AuP+ core, a second layer formed from four FbP units, and an outer layer containing 12 ZnP residues. Here, illumination into a peripheral ZnP leads to highly efficient electronic energy transfer to FbP, followed by charge transfer to the central AuP+. Charge recombination within the resultant charge-shift state is intercepted by secondary hole transfer to the ZnP, which occurs with a quantum yield of around 20%. The final charge-shift state survives for some microseconds in fluid solution at room temperature.

Publication metadata

Author(s): Le Pleux L, Pellegrin Y, Blart E, Odobel F, Harriman A

Publication type: Article

Publication status: Published

Journal: Journal of Physical Chemistry A

Year: 2011

Volume: 115

Issue: 20

Pages: 5069-5080

Print publication date: 02/05/2011

ISSN (print): 1089-5639

ISSN (electronic): 1520-5215

Publisher: American Chemical Society


DOI: 10.1021/jp2012182


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