Record multiphoton absorption cross-sections by dendrimer organometalation

Peter V. Simpson, Laurance A. Watson, Adam Barlow, Genmiao Wang, Marie P. Cifuentes, Mark G. Humphrey

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)


    Large increases in molecular two-photon absorption, the onset of measurable molecular three-photon absorption, and record molecular four-photon absorption in organic π-delocalizable frameworks are achieved by incorporation of bis(diphosphine)ruthenium units with alkynyl linkages. The resultant ruthenium alkynyl-containing dendrimers exhibit strong multiphoton absorption activity through the biological and telecommunications windows in the near-infrared region. The ligated ruthenium units significantly enhance solubility and introduce fully reversible redox switchability to the optical properties. Increasing the ruthenium content leads to substantial increases in multiphoton absorption properties without any loss of optical transparency. This significant improvement in multiphoton absorption performance by incorporation of the organometallic units into the organic π-framework is maintained when the relevant parameters are scaled by molecular weights or number of delocalizable π-electrons. The four-photon absorption cross-section of the most metal-rich dendrimer is an order of magnitude greater than the previous record value.

    Original languageEnglish
    Pages (from-to)2387-2391
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Issue number7
    Publication statusPublished - 12 Feb 2016


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