I. Bioanalytical Applications of Polymer Microfluidic Devices. II. Examination of Soft Vibrational Modes for Alkanes Adsorbed on Copper

Fosser, Kari Andrea

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Description

Title

I. Bioanalytical Applications of Polymer Microfluidic Devices. II. Examination of Soft Vibrational Modes for Alkanes Adsorbed on Copper

Author(s)

Fosser, Kari Andrea

Issue Date

2004

Doctoral Committee Chair(s)

Nuzzo, Ralph G.

Department of Study

Chemistry

Discipline

Chemistry

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Chemistry, Analytical

Language

eng

Abstract

Part II. The study of saturated hydrocarbons on metal surfaces continue to be of interest in order to understand molecule-surface interactions related to C-H bond activation. Interest has also been enhanced by the presence of a unique spectral feature, a broad vibrational mode that is shifted to lower frequency from the normal C-H stretching region. This work explores the appearance and location of this soft mode in non-reactive systems by examining the vibrational spectra of cyclic and linear alkanes on Cu(111). Careful comparisons to theoretical calculations and use of isotope labeled molecules allow us to categorize the soft mode feature as one that originates from the methylene symmetric C-H stretch. The appearance of the soft mode is dependent on the molecule to surface distance and the strength of charge-transfer from the metal to the adsorbate. These studies provide a clearer interpretation regarding spectroscopic features and their significance as it relates to hydrocarbon-metal interactions.

Graduation Semester

2004

Type of Resource

text

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