Porphyrin based self-assembled monolayer thin films. Synthesis and characterization

Journal Article · Wed Jul 28 04:00:00 EDT 1993 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00068a068· OSTI ID:5620824

Li, D Q; Swanson, B I; Robinson, J M; Hoffbauer, M A ^[1]

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1. Los Alamos National Lab., NM (United States)

The synthesis and characterization of covalently bound self-assembled monolayer thin films of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (TPyP) and its derivatives on fused quartz and silicon [100] substrates having a native oxide layer are described. The monolayer film consists of porphyrin macrocycle disk-like structures that were analyzed by UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), and polarized FTIR-ATR measurements. One of the attractive features of these complexes is their large second-order nonlinear optical response, as expected for a strongly delocalized [pi]-electron system without inversion symmetry. Second-harmonic generation (SHG) measurements have been used to determine the absolute value of the dominant element of the nonlinear susceptibility, [chi]-zzz approximately 2 [times] 10[sup [minus]8] esu, the uniformity of these films, and the dispersion of the refractive indices. The average molecular orientation angle of the surface-bound chromophores was measured by both FTIR-ATR and SHG and found to be in good agreement. 31 refs., 3 figs.

• OSTI ID: 5620824
• Journal Information: Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 115:15; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DERIVATIZATION
ELEMENTS
FILMS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFRARED SPECTRA
MINERALS
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDE MINERALS
PHYSICAL PROPERTIES
PORPHYRINS
QUARTZ
SEMIMETALS
SILICON
SPECTRA
SPECTROSCOPY
SYNTHESIS
THIN FILMS