Hybrids of gold nanoparticles and oligo(p-phenyleneethynylene)s end-functionalized with alkynylruthenium groups: Outstanding two-photon absorption in the second biological window
Date
2020-07-16
Authors
Quintana, Cristóbal
Morshedi, Mahbod
Du, Jun
Morrall, Joseph P. L.
Zaręba, Jan K.
Samoc, Marek
Cifuentes, Marie P.
Humphrey, Mark
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Springer Verlag
Abstract
Oligo(p-phenyleneethynylene)s (OPEs) end-capped with (alkynyl)bis(diphosphine)ruthenium and thiol/thiolate groups stabilize ca. 2 nm diameter gold nanoparticles (AuNPs). The morphology, elemental composition and stability of the resultant organometallic OPE/AuNP hybrid materials have been defined using a combination of molecular- and nano-material chacterization techniques. The hybrids display long-term stability in solution (more than a month), good solubility in organic solvents, reversible ruthenium-centered oxidation, and transparency beyond 800 nm, and possess very strong nonlinear absorption activity at the first biological window, and unprecedented two-photon absorption activity in the second biological window (σ2 up to 38,000 GM at 1,050 nm).
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Keywords
gold nanoparticles, inorganic materials, metal alkynyl complexes, nonlinear optics, organometallics
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Nano Research
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Journal article
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Open Access
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