Citation: Ge Yiying, Li Pan, Guan Yanfei, Dong Chang-Ming. Hyperbranched polylysine: Synthesis, mechanism and preparation for NIR-absorbing gold nanoparticles[J]. Chinese Chemical Letters, ;2019, 30(7): 1428-1431. doi: 10.1016/j.cclet.2019.03.009 shu

Hyperbranched polylysine: Synthesis, mechanism and preparation for NIR-absorbing gold nanoparticles

School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China

cmdong@sjtu.edu.cn

Received Date: 7 January 2019
Revised Date: 12 February 2019
Accepted Date: 4 March 2019
Available Online: 5 July 2019

Figures(4)

The ring-opening polymerization (ROP) of N-(tetrafluoroboran ammonium)-L-lysine-N-carboxyanhydride (NH₃BF₄-Lys NCA) was initiated by triethylamine to prepare hyperbranched polylysine (HPlys) fluoroborate with narrow polydispersity at a low temperature. Both mass spectroscopy analysis and DFT computation evidenced that the resultant cyclic dimer mainly initiated ROP as a secondary species according to normal amine mechanism. The hyperbranched polylysine in aqueous solution existed in a unimolecular state at low concentrations, but transformed into spherical micellar aggregates at a high concentration of 5 mg/mL, as characterized by dynamic laser scattering and transmission electron microscopy. By utilizing multivalent coordination interactions between hyperbranched polylysine and gold, the plasmonic gold nanoparticles (HPlys@Au NPs) were successfully prepared in aqueous solution, which elevated the solution by 23.1 ℃ upon 5 min of NIR laser irradiation (808 nm, 2 W/cm²).
- Hyperbranched polylysine,
- NCA,
- ROP,
- NIR,
- Gold nanoparticles
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