Design of a fluorescent and clickable Ag₃₈(SRN₃)₂₄ nanocluster platform: synthesis, modeling and self-assembling

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,...

Synthesis of Photoluminescent 2D Self-Assembled Silver Thiolate Nanoclusters for Sensors and Biomolecule Support

“…Both NC1 and NC2 show a decay time of about 6 ns, as principal, associated with a B factor of 60–70%. This decay is comparable with similar values observed for other Ag-thiolate NCs . These results show that, even if the structural arrangement of the two Ag NCs could be different, the optical behavior of NC1 and NC2 could be comparable, attributed to specific interactions between the core and the shell of the Ag NCs …”

“…The chemical formula of the NC2, mainly determined on the basis of elemental C, H, S, and TGA analyses, is Ag 38 (SR) 24 . It is notable that whereas the synthesis and structure of Au 38 (SR) 24 are well-known, in the case of Ag, the synthesis, but not the structure, has been published. , …”

“…The choice of the reducer depends on the thiolate; the complex with ethanephenyl thiolate needs a stronger reducer with respect to the one with 11carboxylic 2-ol undecanethiolate or with 11-azido 2-ol undecanethiolate. 31 The NCs preparation conditions and their corresponding acronyms and formula are summarized in Table 1. It is notable that the use of alkyl thiosulfates as thiolate precursors, see Experimental Section, is advantageous because they do not have the strong, disagreeable smell of alkanethiols and are soluble in both aqueous and organic solutions.…”

“…The chemical 22 in the case of Ag, the synthesis, but not the structure, has been published. 31,36 The preparation of the NC3, i.e., Ag 38 (SR'COOH) 24 follows a green protocol using ascorbic acid as reducer instead of NaBH 4 . We had previously successfully tested the Ag + reduction using the same ligand but functionalized with a terminal azido (N 3 ) group.…”

Silver thiolate nanoclusters as support for chiral ligands: application in heterogeneous phase asymmetric catalysis

“…It is derived from a click reaction between the amino alcohol ligand 3, the same previously immobilized on magnetic nanoparticles, and the azido-functionalized silver thiolate nanoclusters 4 ( Scheme 2 ). Nanoclusters 4 have already been extensively characterized by our group, 23 with an estimated molecular formula of Ag 38 L 24 and a consequent maximum loading value of 2.4 mmol g −1 . Moreover, nanoclusters 4 were found to be easily recoverable by simple centrifugation in a proper solvent (in which the nanoclusters are less dispersible, for example THF, 2-propanol, acetone, and water).…”