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• W1993779520 abstract "This paper describes electrochemical and spectroscopic properties of a well-characterized, synthetically accessible, 1.1 nm diam Au nanoparticle, Au38(PhC2S)24, where PhC2S is phenylethylthiolate. Properties of other Au38 nanoparticles made by exchanging the monolayer ligands with different thiolate ligands are also described. Voltammetry of the Au38 nanoparticles in CH2Cl2 reveals a 1.62 V energy gap between the first one-electron oxidation and the first reduction. Based on a charging energy correction of ca. 0.29 V, the indicated HOMO−LUMO gap energy is ca. 1.33 eV. At low energies, the optical absorbance spectrum includes peaks at 675 nm (1.84 eV) and 770 nm (1.61 eV) and an absorbance edge at ca. 1.33 eV that gives an optical HOMO−LUMO gap energy that is consistent with the electrochemical estimate. The absorbance at lowest energy is bleached upon electrochemical depletion of the HOMO level. The complete voltammetry contains two separated doublets of oxidation waves, indicating two distinct molecular orbitals, and two reduction steps. The ligand-exchanged nanoparticle Au38(PEG135S)13(PhC2S)11, where PEG135S is −SCH2CH2OCH2CH2OCH3, exhibits a broad (1.77−0.89 eV) near-IR photoluminescence band resolvable into maxima at 902 nm (1.38 eV) and 1025 nm (1.2 eV). Much of the photoluminescence occurs at energies less than the HOMO−LUMO gap energy. A working model of the energy level structure of the Au38 nanoparticle is presented." @default.
• W1993779520 created "2016-06-24" @default.
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• W1993779520 date "2004-04-27" @default.
• W1993779520 modified "2023-10-09" @default.
• W1993779520 title "Electrochemistry and Optical Absorbance and Luminescence of Molecule-like Au₃₈ Nanoparticles" @default.
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• W1993779520 doi "https://doi.org/10.1021/ja049605b" @default.
• W1993779520 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15137785" @default.
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