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Adsorbed .Omega.-hydroxy Thiol Monolayers on Gold Electrodes: Evidence for Electron Tunneling to Redox Species in Solution by Cary Miller; Pierre Cuendet; Michael Graetzel is a Chemistry article available to read on EtoBox.

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In the 180-exchanged reaction, the O2 atoms in the internal SiOH groups or in the nonintact Si-0-Si groups in the nest type defect sites attained the equilibrium state at ca. 15 h. Moreover, the bands at 3505 cm-I were observed less in the IR spectra for the HZSM-5 having fewer defect sites. From these results, it is suggested that the broad band at 3505 cm-I can be identified with the SiOH groups of the hydroxyl nests. If aluminum atoms are inserted into hydroxyl nests in the HZSM-5 by alumination with AICI,, the band at 3505 cm-I will disappear. The IR spectrum for aluminated HZSM-5 prepared from the parent HZSM-5 (sample 9 in Table I) is depicted in Figure 8E. The aluminated HZSM-5 exhibited a new band at 3610 cm-' attributed to the framework Si(0H)AI groups,23 while the band at 3505 cm-' disappeared. These results indicate that ~ ~~~

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Author

Cary Miller; Pierre Cuendet; Michael Graetzel

Published

1991

Language

EN

Field

Chemistry (Physical Sciences)