Abstract
Fluorescent atomically precise Ag38(11-azido-2-ol-undecane-thiolate)24 nanoclusters are easily prepared using sodium ascorbate as a “green” reducer and are extensively characterized by way of elemental analyses, ATR-FTIR, XRD, SAXS, UV-vis, fluorescence spectroscopies, and theoretical modeling. The fluorescence and the atomically determined stoichiometry and structure, the facile and environmentally green synthesis, together with the novel presence of terminal azido groups in the ligands which opens the way to “click”-binding a wide set of molecular species, make Ag38(11-azido-2-ol-undecane-thiolate)24 nanoclusters uniquely appealing systems for biosensing, recognition and functionalization in biomedicine applications and in catalysis.
Highlights
IntroductionThiolate-protected noble metal nanoclusters (noble metal 1⁄4 Au, Ag), called “monolayer protected clusters” (MPC)[1,2] or “atomically precise noble metal thiolate nanoparticles”[3,4] because, differently from noble metal thiolate nanoparticles, they are composed of a precise number of noble metal atoms and thiolate molecules, have emerged as a new type of nanomaterials due to their distinctive physical and chemical properties
Thiolate-protected noble metal nanoclusters, called “monolayer protected clusters” (MPC)[1,2] or “atomically precise noble metal thiolate nanoparticles”[3,4] because, differently from noble metal thiolate nanoparticles, they are composed of a precise number of noble metal atoms and thiolate molecules, have emerged as a new type of nanomaterials due to their distinctive physical and chemical properties
We demonstrate that we have achieved the synthesis of the title compound via an extensive ATR-FTIR, XRD, Small Angle X-ray Scattering (SAXS), UV-vis, and uorescence spectroscopic characterization, combined with theoretical simulation of the atomistic structure, optical response, and assembling
Summary
Thiolate-protected noble metal nanoclusters (noble metal 1⁄4 Au, Ag), called “monolayer protected clusters” (MPC)[1,2] or “atomically precise noble metal thiolate nanoparticles”[3,4] because, differently from noble metal thiolate nanoparticles, they are composed of a precise number of noble metal atoms and thiolate molecules, have emerged as a new type of nanomaterials due to their distinctive physical and chemical properties. Due to the strong quantum con nement effects in the sub[2] nm size regime, Mn(SR)m have discrete electronic states and exhibit some unique molecule-like properties such as quantized charging,[18,19] molecular chirality,[20,21] and photoluminescence.[10,22,23,24,25,26] The properties are highly dependent on the composition and structure of the Mn(SR)m For this reason, it is important to precisely control their composition at the atomic level. Usually an ageing (Ostwald ripening) and separation process are 2948 | Nanoscale Adv., 2021, 3, 2948–2960
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