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. Author manuscript; available in PMC: 2013 Jun 28.
Published in final edited form as: J Am Chem Soc. 2006 Jul 26;128(29):9518–9525. doi: 10.1021/ja062012b

Figure 2.

Figure 2

High resolution XPS spectra of H-C≡C-[Si(111)], and of that surface following the click reaction to form 1s and the reduction of 1s to 2s. A) Si 2p region revealing the near absence of oxide growth during the Cu(I)-catalyzed click reaction, and during the reductive transformation of 1s to 2s. B) Scan of the C 1s region of H-C≡C-[Si(111)]. The Si-C peak is unique to H-C≡C-[Si(111)] surfaces. The C-C peak contains contributions from the C≡C bond and adventitious carbon from the environment. The C-O peak present also arises from adventitious hydrocarbons. C) Scan of the N 1s region of 1s, validating the click formation of 1s. The area ratio of the three peaks is 1:2:1, respectively. D) Scan of the Fe 2p region showing the formation of 3s via the amide coupling of ferrocene carboxylic acid to 2s. The control plots are of 1s (dark grey) and the H-C≡C-[Si(111)] surface (light grey) after exposure to ferrocene carboxylic acid under the same conditions.