J. Phys. Chem. B, 106 (11), 2933 -2936, 2002. 10.1021/jp011876a S1089-5647(01)01876-4
Web Release Date: February 16, 2002

Copyright © 2002 American Chemical Society

A Thiol-Substituted Carotenoid Self-Assembles on Gold Surfaces

Dezhong Liu, Gregory J. Szulczewski,* and Lowell D. Kispert*

Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487-0336

Alex Primak, Thomas A. Moore, Ana L. Moore, and Devens Gust

Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604

Received: May 16, 2001

In Final Form: December 17, 2001

Abstract:

A thiol-substituted carotenoid, 7'-apo-7'-(4-mercaptomethylphenyl)--carotene, (AMC) was allowed to self-assemble on polycrystalline gold surfaces. The stability, packing density, optical absorption, and hydrophobicity of the resulting monolayers were investigated with X-ray photoelectron spectroscopy (XPS), Fourier transform infrared reflection-absorption spectroscopy (FTIR-RAS), UV-Vis spectroscopy, spectroscopic ellipsometry, and contact angle measurements. XPS and spectroscopic ellipsometry measurements reveal the saturation coverage is ~4 × 1014 AMC molecules/cm2 and the film thickness is ~20 Å, respectively. FTIR-RAS and contact angle measurements suggest that the polyene chains are packed well enough to create a hydrophobic interface.

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