scholarly journals The impact of lipid head-groups in GUVs on electron transfer by surface-adsorbed fluorescent gold nanoclusters

2021 ◽  
Author(s):  
Arunavo Chatterjee ◽  
Pradipta Purkayastha
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Aqueous Medium ◽  
Photoinduced Electron Transfer ◽  
Gold Nanoclusters ◽  
Metal Charge ◽  
Head Groups ◽  
The Impact ◽  
Metal Charge Transfer

The ligand-to-metal charge transfer in gold nanoclusters gets influenced by the interacting lipid that regulates photoinduced electron transfer in the aqueous medium.

scholarly journals The Emission Mechanism of Gold Nanoclusters Capped with 11-Mercaptoundecanoic Acid, and the Detection of Methanol in Adulterated Wine Model

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6342
Author(s):  
Ming Wei ◽  
Ye Tian ◽  
Lijun Wang ◽  
Yuankai Hong ◽  
Dan Luo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Stokes Shift ◽  
Gold Nanoclusters ◽  
Absorption Peak ◽  
Suitable Model ◽  
Photoluminescence Excitation ◽  
Emission Mechanism ◽  
Metal Charge ◽  
Wine Models ◽  
Metal Charge Transfer

The absorption and emission mechanisms of gold nanoclusters (AuNCs) have yet to be understood. In this article, 11-Mercaptoundecanoic acid (MUA) capped AuNCs (AuNC@MUA) were synthesized using the chemical etching method. Compared with MUA, AuNC@MUA had three obvious absorption peaks at 280 nm, 360 nm, and 390 nm; its photoluminescence excitation (PLE) peak and photoluminescence (PL) peak were located at 285 nm and 600 nm, respectively. The AuNC@MUA was hardly emissive when 360 nm and 390 nm were chosen as excitation wavelengths. The extremely large stokes-shift (>300 nm), and the mismatch between the excitation peaks and absorption peaks of AuNC@MUA, make it a particularly suitable model for studying the emission mechanism. When the ligands were partially removed by a small amount of sodium hypochlorite (NaClO) solution, the absorption peak showed a remarkable rise at 288 nm and declines at 360 nm and 390 nm. These experimental results illustrated that the absorption peak at 288 nm was mainly from metal-to-metal charge transfer (MMCT), while the absorption peaks at 360 nm and 390 nm were mainly from ligand-to-metal charge transfer (LMCT). The PLE peak coincided with the former absorption peak, which implied that the emission of the AuNC@MUA was originally from MMCT. It was also interesting that the emission mechanism could be switched to LMCT from MMCT by decreasing the size of the nanoclusters using 16-mercaptohexadecanoic acid (MHA), which possesses a stronger etching ability. Moreover, due to the different PL intensities of AuNC@MUA in methanol, ethanol, and water, it has been successfully applied in detecting methanol in adulterated wine models (methanol-ethanol-water mixtures).

Tuning metal to metal charge transfer properties in cyanidometal-bridged complexes by changing the auxiliary ligand on the bridge

2021 ◽  
Author(s):  
Qing-Dou Xu ◽  
Chen Zeng ◽  
Shao-Dong Su ◽  
Yu-Ying Yang ◽  
Sheng-Min Hu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Auxiliary Ligand ◽  
Metal Charge ◽  
Transfer Properties ◽  
Metal Charge Transfer

This work shows that the energy of MMCT in cyanidometal-bridged complexes can be tuned systematically by changing the auxiliary ligand of the cyanidometal bridge.

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