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1.
Figure 5

Figure 5. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Cartoon depiction showing hypothesized steric effects for dendrons during conjugate formation.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
2.
Figure 2

Figure 2. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

DLS intensity-weighted size distributions obtained for Au conjugates using NNLS; (a) Au-G1-COOH, (b) Au-G2-COOH, (c) Au-SH-G1-COOH, and (d) Au-TA-G1-COOH

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
3.
Figure 7

Figure 7. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

SPR bands for the Au-TA-G1-COOH conjugate as a function of pH (f = 10). The behavior exhibited here is generically similar for all dendron conjugated AuNPs.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
4.
Figure 10

Figure 10. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Normalized absorbance decay at 520 nm for AuNPs following treatment with 2.0 mmol/L KCN solution: () citrate-capped AuNPs, (○) Au-G1-COOH, () Au-G2-COOH, () Au-SH-G1-COOH, () Au-TA-G1-COOH, and () Au-MUA.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
5.
Figure 4

Figure 4. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

High resolution XPS spectra for the S 2p region collected for a) Au-G1-COOH, b) Au-G2-COOH, c) Au-SH-G1-COOH, d) Au-TA-G1-COOH, and e) Au-MUA.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
6.
Scheme 1

Scheme 1. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Synthesis of 2-directional cystamine core dendrons 4 (G1-COOH), and 7 (G2-COOH) a
aReagents and Conditions: i) Et3N, THF, r.t., 12 h; ii) Formic acid, r.t., overnight; iii) DCC, 1-HOBT, DMF, r.t., overnight.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
7.
Scheme 2

Scheme 2. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Preparation of 1-directional dendrons 8 (SH-G1-COOH) and 11 (TA-G1-COOH)a
aReagents and Conditions: i) DTE, citrate buffer (pH 6.2), 55 °C, overnight; ii) DCC, 1-HOBT, THF, r.t., overnight; iii) Formic acid, r.t., overnight.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
8.
Figure 9

Figure 9. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Cartoon depiction of the effects induced by surface conformation of functionalized AuNPs in resisting cyanide ions: (a) branch or chain length effect; (b) sulfur coverage effect; (c) complementary effects.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
9.
Figure 3

Figure 3. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Representative high resolution XPS spectra for a) C 1s, b) N 1s, c) Au 4f and d) S 2p regions collected for Au-G1-COOH conjugates. The peak shape was consistent across samples.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
10.
Figure 1

Figure 1. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Cartoon depictions of conjugates and their preparation processes based on reacting dendron solutions with citrate stabilized AuNP suspensions at room temperature for 5 h; the relative sizes are not to scale and the number of molecules shown is not a realistic reflection of the actual surface site density.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
11.
Figure 6

Figure 6. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

(Left column): Stability of conjugates in different media (dilution factor f = 10): in DI water (circles), in 2 mmol/L NaCl (squares), and in PBS (triangles) monitored by DLS over 2 weeks. Results shown for (a) Au-G1-COOH, (b) Au-G2-COOH, (c) Au-SH-G1-COOH, (d) Au-TA-G1-COOH; (Right column): Stability of Au-SH-G1-COOH in (e) PBS by UV-Vis over 2 weeks, (f) citrate AuNP over 1 d in PBS at 20 °C.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.
12.
Figure 8

Figure 8. From: Newkome-type dendron stabilized gold nanoparticles: Synthesis, reactivity, and stability.

Time dependent studies of AuNPs in acidic media (pH 3). UV-Vis absorbance spectra for (a) citrate-capped AuNPs and (b) Au-TA-G1-COOH; vertical marker (⋯) indicates 520 nm. (c) Z-average size versus time for (•) citrate-capped AuNPs and (○) Au-TA-G1-COOH. (d, f) AFM height and (e, g) amplitude images of citrate-capped AuNPs (d,e) and Au-TA-G1-COOH (f,g) after 48 h at pH 3; scale bars are 100 nm, z-scale is 20 nm for height images.; (h) Cartoon depiction of cluster formation mechanism comparing citrate-capped AuNPs and AuNP-dendron conjugates under acidic conditions.

Tae Joon Cho, et al. Chem Mater. ;23(10):2665-2676.

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