Sequential dehydrogenation of unsaturated cyclic C5 and C6 hydrocarbons on Pt(111)

Article Abstract:

A study was conducted to analyze the structures and reactivities of different cyclic C5 and C6 hydrocarbons adsorbed on Pt(111) using reflection-absorption infrared spectroscopy. An ultrahigh-vacuum chamber supporter a base pressure of less than 4x10(super -10) Torr ws utilized to carry out the study. Results indicated a number of structural factors that affect the bonding and reactivities of hydrocarbons on transition metal surfaces. These include crystallographic orientation, step density and the presence of functional groups in the adsorbate.

Usage, Surfaces (Materials), Infrared spectroscopy, Dehydrogenation, Surfaces (Technology)

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Structures and reactivities of cycloheptane, cycloheptene, 1,3-cycloheptadiene, and cycloheptatriene on Pt(111)

Article Abstract:

Temperature-programmed, reflection-absorption and Auger electron spectroscopies were used to investigate the structures and reactivities of cycloheptane, cycloheptene, 1,3-cycloheptadiene, and cycloheptatriene adsorbed on Pt(111). Results suggested that there is an insignificant correlation between the appearance of soft modes seen in the vibrational spectra and the specific patterns of C-H bond activation that occurs upon heating. All the unsaturated cyclic C7 adsorbates were also found to decompose to give the same cycloheptatrienyl product.

Molecular structure, Adsorption

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Carbon-hydrogen bond activation and cyclodehydrogenation reactions of cyclic C8 hydrocarbons on Pt(111)

Article Abstract:

An analysis of the thermolytic decomposition of unsaturated cyclic C8 hydrocarbons on a platinum(111) single crystal surface showed that a novel surface-bound bicyclic ring system is produced by dehydrocyclization with several intermediate products. One of the products, pentalenyl, remains stable up to temperatures of at least 450 K. Higher temperatures makes this intermediate product fragment and release hydrogen.

Activated carbon, Surface chemistry, Chemical bonds, Carbon, Activated

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