Jump to main content
Jump to site search

Issue 42, 2012
Previous Article Next Article

Sequential energy and charge transfer processes in mixed host–guest complexes of subphthalocyanine, porphyrin and phthalocyanine chromophores

Author affiliations

Abstract

Porphyrins, phthalocyanines and subphthalocyanines are three attractive classes of chromophores with intriguing properties making them suitable for the design of artificial photosynthetic systems. The assembly of these components by a supramolecular approach is of particular interest as it provides a facile means to build multi-chromophoric arrays with various architectures and tuneable photophysical properties. In this paper, we show the formation of mixed host–guest supramolecular complexes that consist of a β-cyclodextrin-conjugated subphthalocyanine, a tetrasulfonated porphyrin and a series of silicon(IV) phthalocyanines substituted axially with two β-cyclodextrins via different spacers. We found that the three components form supramolecular complexes held by host–guest interactions in aqueous solution. Upon excitation of the subphthalocyanine part of the complex, the excitation energy is delivered to the phthalocyanine unit via excitation energy transfer and the porphyrin chromophore acts as an energy transfer bridge enabling this process. It was shown that photo-induced charge transfer also takes place. A sequential electron transfer process from the porphyrin unit to the phthalocyanine moiety and subsequently from the subphthalocyanine moiety to the porphyrin unit takes place, and the probability of this process is controlled by the linker between β-cyclodextrin and phthalocyanine. The lifetime of the charge-separated state was found to be 1.7 ns by transient absorption spectroscopy.

Graphical abstract: Sequential energy and charge transfer processes in mixed host–guest complexes of subphthalocyanine, porphyrin and phthalocyanine chromophores

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Jul 2012, accepted on 05 Sep 2012 and first published on 06 Sep 2012


Article type: Paper
DOI: 10.1039/C2CP42416A
Citation: Phys. Chem. Chem. Phys., 2012,14, 14573-14584
  •   Request permissions

    Sequential energy and charge transfer processes in mixed host–guest complexes of subphthalocyanine, porphyrin and phthalocyanine chromophores

    R. Menting, D. K. P. Ng, B. Röder and E. A. Ermilov, Phys. Chem. Chem. Phys., 2012, 14, 14573
    DOI: 10.1039/C2CP42416A

Search articles by author

Spotlight

Advertisements