Supporting Information
Comparative Study of Amphiphilic Hyperbranched and Linear Polymer
Stabilized Organo-Soluble Gold Nanoparticles as Efficient Recyclable
Catalysts in the Biphasic Reduction of 4-Nitrophenol
NAN HU,1 JING-YUAN YIN,1 QIANG TANG1, YU CHEN*1,2
1
Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, People’s Republic
of China
2
Key Laboratory of Molecular Engineering of Polymers (Fudan University), Ministry of Education,
People’s Republic of China
Correspondence to: Y. Chen (E-mail: chenyu@tju.edu.cn)
1
Fig. S1 TEM images of gold nanoparticles stabilized by different polymers with different ratio of
[N]/[Au] (All the scale bar is 20 nm)
2
Fig. S2 Typical photos of the solution of different sized gold nanoparticles stabilized by the amphiphilic
polymers (A) d=3.2±1.0 nm; (B) d=3.8±1.5 nm; (C) d=5.3±2.1 nm; (D) d=8.6±3.8 nm; (E) d=9.4±4.1
nm. ([Au]= 2.50×10-4 M, HPEI25K-C160.73 as stabilizer, different [N]/[Au] ratio)
Fig. S3 The photos of the solutions of gold nanoparticles stabilized by HPEI10K-C160.73 (A) fresh; (B)
2 months later. ([Au]= 2.50×10-4 M, [N]/[Au] =10)
3
Fig. S4 TEM images of gold nanoparticles (A) fresh ones stabilized by HPEI10K-C160.73 with
[N]/[Au]=10; (B) fresh ones stabilized by HPEI10K-C160.73 with [N]/[Au]=1; (C) stabilized by
HPEI10K-C160.73 with [N]/[Au]=10 after 70 days; (D) stabilized by HPEI10K-C160.73 with [N]/[Au]=1
after 70 days; (All the scale bar is 20 nm)
4
50
Time
(min)
0
40
0.5
1
2
3
4
6
Abs.
30
20
10
0
300
350
400
(nm)
450
500
550
Fig. S5 The UV-vis absorbance spectra of the AuNP catalyzed reduction of 4-nitrophenol by NaBH4
(20.0 mL of aqueous phase: [4-nitrophenol]=3.0 ×10-3 M, [NaBH4] =0.30 M; 4.0 mL of chloroform
phase: [Au] =3.13 ×10-5 M, [N]/[Au]=10 at 32 oC).
5
Fig. S6 Typical TEM image of gold nanoparticles showing very less catalytic activity after reusing
certain times
6
*
N x
O
*
N y
H
adsorb on AuNP
LPEI15K-C160.73
AuNP
:
O
Fig. S7 Illustrations of AuNPs stabilized by the amphiphilic linear polymers.
7