Self-assembled monolayers on gold of thiols incorporating conjugated terminal groups

Journal Article · Thu Dec 03 04:00:00 EST 1998 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

DOI:https://doi.org/10.1021/jp9821174· OSTI ID:316057

Reese, S; Fox, M A ^[1]

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1. Univ. of Texas, Austin, TX (United States). Dept. of Chemistry and Biochemistry

Thiols 3, 6, and 14 incorporating {omega}-attached conjugated aromatic groups from self-assembled monolayers (SAMs) on polycrystalline gold. The thicknesses of the films as measured by optical ellipsometry correspond well to the expected thickness of monolayer films in which the components are oriented roughly perpendicular to the Au surface. Cyclic voltammetry measurements of K{sub 4}Fe(CN){sub 6} in aqueous KCl solution on a SAM modified gold electrode show that these monolayers are densely packed and attenuate electron transfer between the gold and the solution electrophore. Grazing angle reflectance-Fourier transform infrared spectroscopy (GAR-FTIR) shows that the conjugated arenes of 3, 6, and 14, as well as the C{sub 6} chains of thiols 6 and 14, are roughly perpendicular to the plane of the Au surface. Fluorescence spectroscopy indicates that the terminal arenes in SAMs of 6 and of 11 interact, causing red-shifted, structured emission in the SAM relative to that observed for the same species in dilute homogeneous solution.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• OSTI ID: 316057
• Journal Information: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 49 Vol. 102; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELLIPSOMETRY
FILMS
FOURIER TRANSFORM SPECTROMETERS
GOLD
MOLECULAR STRUCTURE
SUBSTRATES
SYNTHESIS
THIOLS