Vibrational characterization of Langmuir-Blodgett monolayers and evaporated films of a bisphenylene-substituted perylene-3,4,9,10-tetracarboxylic acid derivative

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Langmuir; (USA)

DOI:https://doi.org/10.1021/la00096a004· OSTI ID:6260212

Aroca, P Jr; Aroca, R ^[1]; Kovacs, G J; Loutfy, R O ^[2]

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1. Univ. of Windsor, Ontario (Canada)
2. Xerox Research Centre of Canada, Mississauga, Ontario (Canada)

The vibrational spectra of a bisphenylene-substituted perylene-3,4,9,10-tetracarboxylic acid derivative (BPTCA) in thin solid films and Langmuir-Blodgett (LB) monolayers have been studied with IR and Raman spectroscopy. The molecular spectra of BPTCA evaporated at monolayer coverage were obtained by using surface-enhanced resonant Raman scattering (SERRS) on Ag-coated Sn spheres. Evaporated BPTCA films did not show any signs of preferred molecular orientation and were physisorbed onto the Ag surfaces. Stable LB layers of BPTCA mixed with arachidic acid were prepared and transferred to glass and to glass coated with the SERS active surface. An edge-on molecular orientation of BPTCA in the mixed monomolecular layer was identified from the SERRS spectra on Ag; the spectra indicated chemisorption and a well-defined metal-molecule interaction. SERRS of BPTCA detached from the surface was also obtained by inserting an LB spacer layer of fatty acid between the BPTCA and the Ag surface; evidence for the chemisorption disappeared in the spectra of the detached layer.

• OSTI ID: 6260212
• Journal Information: Langmuir; (USA), Vol. 6:6; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBOXYLIC ACIDS
VIBRATIONAL STATES
THIN FILMS
EXPERIMENTAL DATA
INFRARED SPECTRA
PERYLENE
PHASE STUDIES
RAMAN SPECTROSCOPY
AROMATICS
CONDENSED AROMATICS
DATA
ENERGY LEVELS
EXCITED STATES
FILMS
INFORMATION
LASER SPECTROSCOPY
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
SPECTRA
SPECTROSCOPY
360602* - Other Materials- Structure & Phase Studies
400102 - Chemical & Spectral Procedures