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33748581506
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note
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We assume that in previously described experiments (refs. [2,9]) impurities also formed an ultrathin organic coating on HOPG. Given the complexity and the unspecific host capability of higher generation denpols, the presence of impurities stemming from solvents and reagents used during synthesis cannot be excluded even if several purification steps are applied. Carefully dried denpols give correct data in combustion analysis. This, however, is insufficient evidence to propose that there are no impurities still being entrapped in the branched layer around the backbone. The amount of material required to form a monolayer on a solid substrate is so small that it cannot possibly be detected by combustion analysis. The experiments described in references [2] and [9] were carried out with denpols prepared on the solid substrate directly from the reaction mixture. It is therefore necessary to assume that products from the final azidification step have interfered in one way or another with both the adsorption to and lateral diffusion of the denpols on the surface. A main advantage of the experiments described here is the fact that they can be carried out under ambient conditions. The price to be paid for this, and thus a further complication, is the unclear situation with adsorptions of compounds contained in the surrounding air prior to the application of the denpols.
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Severin, N.1
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a) S. Fuchs, H. Otto, S. Jehle, P. Henklein, A. D. Schlüter, Chem. Commun. 2005, 1830-1832;
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Otto, H.2
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1642340731
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and references therein
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b) S. Fuchs, T. Kapp, H. Otto, T. Schöneberg, P. Franke, R. Gust, A. D. Schlüter, Chem. Eur. J. 2004, 10, 1167-1192, and references therein.
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Kapp, T.2
Otto, H.3
Schöneberg, T.4
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For example, see: a) N. Ouali, S. Méry. A. Skoulios, Macromolecules 2000, 33, 6185-6193;
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b) A. Zhang, B. Zhang, E. Wächtersbach, M. Schmidt, A.D. Schlüter, Chem. Eur. J. 2003, 9, 6083-6092;
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c) M. Malkoch, A. Carlmark, A. Woldegiorgis, A. Hult, E. E. Malmström, Macromolecules 2004, 37, 322-329;
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e) J. L. Mynar, T.-L. Choi, M. Yoshida, V. Kim, C. J. Hawker, J. M. J. Fréchet, Chem. Commun. 2005, 5169-5171.
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33748557086
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R. Al-Hellani, A. D. Schlüter, unpublished results
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R. Al-Hellani, A. D. Schlüter, unpublished results.
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0000945664
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L. Shu, A. D. Schlüter, C. Ecker, N. Severin, J. P. Rabe, Angew. Chem. 2001, 113, 4802-4805;
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L. Shu, I. Gössl, J. P. Rabe, A. D. Schlüter, Macromol. Chem. Phys. 2002, 203, 2540-2550.
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25444471047
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The yield for this compound by mistake was given as 95%: S. Müller, A. D. Schlüter, Chem. Eur. J. 2005, 11, 5589-5610. The fully reproducible value is 65%, which was obtained in runs with up to 25 g of product.
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Müller, S.1
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0002916665
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and references therein
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For example, see: L. Shu, A.D. Schlüter, Macromol. Chem. Phys. 2000, 201, 239-245, and references therein.
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33748576097
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note
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During the synthesis of model compound 2c it was observed that if the reaction was performed at 0°C, the amines were doubly dansylated to a small extent (NMR spectroscopy). This is why, under the more forceful conditions, the temperature was not elevated above -10°C.
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C. Böttcher, B. Schade, C. Ecker, J. P. Rabe, L. Shu, A. D. Schlüter, Chem. Eur. J. 2005, 11, 2923-2928.
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