Jump to main content
Jump to site search

Issue 11, 2012
Previous Article Next Article

Supramolecular control during triplet sensitized geometric isomerization of stilbenes encapsulated in a water soluble organic capsule

Author affiliations

Abstract

Triplet sensitized photoisomerization of several stilbenes included within a water-soluble organic capsule has been investigated. In this study octa acid that self assembles in the presence of hydrophobic guest molecules to form a host–guest complex is utilized to solubilize hydrophobic stilbenes and triplet sensitizers in water, and to provide confinement during the geometric isomerization of included olefins. By monitoring the steady state and time resolved room temperature phosphorescence from 4,4′-dimethylbenzil in the presence of acceptor stilbenes and their nitrogen analogues (stilbazole and bispyridyl ethylene) we have been able to establish that triplet-triplet energy transfer occurs between encapsulated donors and encapsulated (or free) acceptors. The mechanism of the energy transfer process is yet to be fully understood although a similar phenomenon has been reported earlier in the literature with Cram's hemicarcerand as the host. The photostationary state composition of cis and trans isomers within the OA capsule is dependent on the relative binding strength of the two isomers with the OA capsule. Further investigation is needed to fully exploit the interesting observations made here to steer the photoisomerization towards a single isomer.

Graphical abstract: Supramolecular control during triplet sensitized geometric isomerization of stilbenes encapsulated in a water soluble organic capsule

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Apr 2012, accepted on 19 May 2012 and first published on 24 May 2012


Article type: Paper
DOI: 10.1039/C2PP25115A
Citation: Photochem. Photobiol. Sci., 2012,11, 1652-1660
  •   Request permissions

    Supramolecular control during triplet sensitized geometric isomerization of stilbenes encapsulated in a water soluble organic capsule

    S. R. Samanta, A. Parthasarathy and V. Ramamurthy, Photochem. Photobiol. Sci., 2012, 11, 1652
    DOI: 10.1039/C2PP25115A

Search articles by author

Spotlight

Advertisements