Synthesis of Yellow-Emitting Platinum Nanoclusters by Ligand Etching

Abstract

New types of fluorescent platinum nanoclusters (λ max. = 570 nm) have been synthesized using glutathione for ligand etching. These nanoclusters are mainly in the oxidation state Pt I (90%) exhibiting an intense fluorescence signal (QY∼17%) in the yellow region and lead to the formation of blue-emitting species for a long etching time process.

Efficient red luminescence from organic-soluble Au25 clusters by ligand structure modification

“…Based on the above observation, we optimized the conditions to get red luminescent clusters in high yield, which involved the following steps: (i) synthesis of the precursor Au 25 SBB 18 QCs, (ii) thermal treatment of Au 25 QCs for 24 h and addition of definite amounts of Au(I)SBB thiolate to the reaction medium at definite intervals and (iii) rapid cooling. [51][52][53][54][55][56] Core etching of nanoparticles/clusters in aqueous medium to form smaller clusters with luminescence are well known in the literature. Though a dampening of the characteristic absorption features of Au 25 clusters (black trace in Figure 1A) was observed for the redluminescent clusters (red trace), a distinct shoulder at 707 nm was observed in the case of the latter (see Figure S3).…”

Preparation of Pt Nanoclusters with Different Emission Wavelengths and Their Application in Co2+ Detection

“…For example, Iwasaki's group [15] showed the surfactant-free synthesis of fluorescent Pt NCs in N,N-dimethylformamide (DMF) solution. [17] The fluorescence emission wavelength from these previous reports mostly focused on the blue and green regions and only involved a single emission wavelength. Fluorescent Pt NCs (l max = 570 nm) have also been synthesized using glutathione (GSH) for ligand etching.…”

“…Compared to other methods, which always involve complicated etching or separation processes, [17] this protocol is easier to implement and simplifies the experiment. Compared to other methods, which always involve complicated etching or separation processes, [17] this protocol is easier to implement and simplifies the experiment.…”

“…Fluorescent Pt NCs (l max = 570 nm) have also been synthesized using glutathione (GSH) for ligand etching. [17] The fluorescence emission wavelength from these previous reports mostly focused on the blue and green regions and only involved a single emission wavelength. Fluorescence of longer wavelengths has less auto-fluorescence and more clinical safety, suggesting different colours could expand the range of applications, which makes Pt NCs attractive to bio-sensing and bio-imaging studies.…”

“…Additionally, these fluorescent Pt NCs can be applied to the sensitive and quantitative detection of Co 2 + ions at concentrations as low as 500 nm.A facile one-pot reduction was utilized to synthesize ultrasmall aqueous fluorescent Pt NCs. Compared to other methods, which always involve complicated etching or separation processes, [17] this protocol is easier to implement and simplifies the experiment. UV/Vis spectra were employed to monitor the interaction between H 2 PtCl 6 and the polymer ligand PEI.…”