Jump to main content
Jump to site search


Successive energy transfer within multiple photosensitizers assembled in a hexameric hemoprotein scaffold

Author affiliations

Abstract

An assembly of multiple photosensitizers is demonstrated by development of a hexameric hemoprotein (HTHP) scaffold as a light harvesting model to replicate the successive energy transfer occuring within photosensitizer assemblies of natural systems. In our model, six zinc protoporphyrin IX (ZnPP) molecules are arrayed at the heme binding site of HTHP by supramolecular interactions and five fluorescein (Flu) molecules and one Texas Red (Tex) molecule as donor and acceptor photosensitizers, respectively, are attached to the HTHP protein surface with covalent linkages. The flow of excited energy from photoexcited Flu to Tex occurs via two pathways: direct energy transfer from Flu to Tex (path 1) and energy transfer via ZnPP (path 2). Steady state and time-resolved fluorescence measurements reveal that the energy transfer ratio of these pathways (path 1 : path 2) is 39 : 61. These findings indicate that the excited energy originating at five Flu and six ZnPP molecules is collected at one Tex molecule as a funnel-like bottom for light harvesting. The present system using the hexameric hemoprotein scaffold is a promising candidate for construction of an artificial light harvesting system having multiple photosensitizers to promote efficient use of solar energy.

Graphical abstract: Successive energy transfer within multiple photosensitizers assembled in a hexameric hemoprotein scaffold

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Aug 2017, accepted on 19 Oct 2017 and first published on 19 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05257J
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
  •   Request permissions

    Successive energy transfer within multiple photosensitizers assembled in a hexameric hemoprotein scaffold

    T. Mashima, K. Oohora and T. Hayashi, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05257J

Search articles by author

Spotlight

Advertisements