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Updated: Jan 24, 2026

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
Published on: March 22, 2020
The Structure of a Au7Cu12 Bimetal Nanocluster and Its Strong Emission
Yongbo Song1, Shiyin Weng1, Hao Li1
1Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials , Anhui University , Hefei , Anhui 230601 , People's Republic of China.
Abstract:
Herein, a Au-Cu bimetal nanocluster (bi-MNC) with strong emission (13.2% quantum yield) was synthesized and structurally determined. Its structure features a sandwich construction: a ring-like Au7Cu6 kernel is caught in the middle of the two "hat-like" (CuSPNC)3 motifs with four Br atoms, resulting in a formula of [Au7Cu12(dppy)6(TBBT)6Br4]3+ (dppy = PPh2Py, TBBT = SPh- t-Bu). Interestingly, structural analysis shows that the bonding (N-Cu and μ3S-Cu3) is the key factor to endow this bi-MNC with strong emission by locking the intramolecular motion of surface structure, and destroying the intramolecular π···π interactions is designed to boost emission (19.2% vs 13.2%). Furthermore, the structure-luminescence relationship is further explored by theoretical calculation. This work will provide new idea and strategy to prepare bi-MNCs with strong emission.
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Titration Calculations: Strong Acid - Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
Strong Acid and Base Solutions
Titration of a Strong Acid with a Strong Base
Emission Spectra
Titration Calculations: Weak Acid - Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
Titration of a Weak Acid with a Strong Base

