@article{Quintana2020, author = {Cristóbal Quintana and Mahbod Morshedi and Jun Du and Joseph P.L. Morrall and Jan K. Zaręba and Marek Samoc and Marie P. Cifuentes and Mark G. Humphrey}, title = {Hybrids of gold nanoparticles and oligo(p-phenyleneethynylene)s end-functionalized with alkynylruthenium groups: Outstanding two-photon absorption in the second biological window}, year = {2020}, journal = {Nano Research}, volume = {13}, number = {10}, pages = {2755-2762}, keywords = {gold nanoparticles, nonlinear optics, inorganic materials, metal alkynyl complexes, organometallics}, url = {https://www.sciopen.com/article/10.1007/s12274-020-2924-4}, doi = {10.1007/s12274-020-2924-4}, 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).} }