Chiral supramolecular gold-cysteine nanoparticles: Chiroptical and nonlinear optical properties

Isomeric Effect of Mercaptobenzoic Acids on the Synthesis, Stability, and Optical Properties of Au25(MBA)18 Nanoclusters

“…A broad band in the visible range between 400 and 600 nm and centered at about 470 nm is observed, as already reported for other gold–thiolate systems. 44,45 Two-photon excitation involved different electronic transitions than those involved in one-photon excitation. 46 This two photon excited photoemission can be attributed to transitions within the metal core.…”

Sub-100 nanometer silver doped gold–cysteine supramolecular assemblies with enhanced nonlinear optical properties

“…The circular dichroism (CD) signals for -Au-Cys and Ag-doped Au-Cys NPs supramolecular assemblies present a positive band at ~360 nm, signature of the formation of a helical chiral structure. [4][5][6] L-cysteine, a chiral natural amino-acid is used in this work. The structure suggesting chirality over some length scale might be due to the specific electrostatic interaction among the −SR side chains in the Au(I)−Cys polymeric backbone, which likely results in some helicity.…”

“…In particular, by using cysteine as the thiolate compound, the synergetic interplay of the electrostatic interaction between -cysteine side chains and the Au(I)…Au(I) aurophilic attraction in the Au(I)-Cys polymeric backbone may result in some helicity. [4][5][6] On the other hand, under controlled external parameters (temperature, pH …), Au(I)-cysteine polymers can further assemble into bulky precipitate with lamellar structures. 7 This capability to self-assemble into hierarchical structures leads also to unusual structure−optical property relationship.…”

“…6 The investigation of the nonlinear optical (NLO) properties of silver and gold thiolated supramolecules is still in its infancy, and only few reports on NLO measurements have been reported. 5,10,11 We have recently shown that, although non-fluorescent through one-photon excitation, gold-cysteine supramolecular assemblies present two-photon excited fluorescence. They also exhibit second harmonic generation.…”

Structural insights into glutathione-protected gold Au10−12(SG)10−12 nanoclusters revealed by ion mobility mass spectrometry

“…Au10-12(SG)10-12 NCs with neutral glutathione ligands were optimized using the PM7 semi-empirical Hamiltonian implemented in the MOPAC2016 code, [24,25] found to give reasonably good agreement for calculated interaction parameters for gold-sulfur complexes. [26]…”