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Issue 11, 2012
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Two-photon absorption of metal–organic DNA-probes

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We report remarkable multiphoton absorption properties of DNA intercalating ruthenium complexes: (1) [Ru(phen)2dppz]2+; (2) [(11,11′-bidppz)(phen)4Ru2]4+; (3) [11,11′-bipb(phen)4Ru2]4+. Two-photon spectra in the range from 460 to 1100 nm were measured using the Z-scan technique. In particular, complex 2 was found to exhibit very strong two- and three-photon absorption properties, which could be an effect of symmetric charge transfer from the ends towards the middle of the conjugated dimeric orbital system. We propose that these molecules could provide a new generation of DNA binding nonlinear chromophores for wide applications in biology and material science. The combination of a large two-photon cross section and strong luminescence quantum yields for the molecules when intercalated makes the compounds uniquely bright and photo-stable probes for two-photon luminescence imaging and also promising as enhanced photosensitizers in two-photon sensitizing applications.

Graphical abstract: Two-photon absorption of metal–organic DNA-probes

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Publication details

The article was received on 25 Nov 2011, accepted on 06 Jan 2012 and first published on 01 Feb 2012

Article type: Communication
DOI: 10.1039/C2DT12264B
Citation: Dalton Trans., 2012,41, 3123-3125
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    Two-photon absorption of metal–organic DNA-probes

    P. Hanczyc, B. Norden and M. Samoc, Dalton Trans., 2012, 41, 3123
    DOI: 10.1039/C2DT12264B

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