Interaction of Single and Multiple Layers of Copper Acetylacetonate Complexes with Silica Surfaces: An Infrared Diffuse Reflectance Study

The surface structure of copper acetylacetonate [Cu(acac)[sub 2]] on silica has been characterized using diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. Infrared spectroscopy has been used to determine the nature of the supported complex with regard to whether the complex is pre...

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Bibliographic Details
Published in:Langmuir 1994-12, Vol.10 (12), p.4523-4529
Main Authors: Mitchell, Mark B, Chakravarthy, Vasumathi R, White, Mark G
Format: Article
Language:English
Subjects:
400102 > Chemical & Spectral Procedures
ACETONITRILE
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL BONDS
Chemistry
COMPILED DATA
COMPLEXES
COPPER COMPLEXES
CRYSTALS
DATA
Exact sciences and technology
General and physical chemistry
INFORMATION
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LAYERS
LIGANDS
MINERALS
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POWDERS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
Solid-liquid interface
SPECTRA
Surface physical chemistry
TRANSITION ELEMENT COMPLEXES 400201 > Chemical & Physicochemical Properties
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Summary:The surface structure of copper acetylacetonate [Cu(acac)[sub 2]] on silica has been characterized using diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. Infrared spectroscopy has been used to determine the nature of the supported complex with regard to whether the complex is present on the surface as a single layer or as multiple layers. The copper acetylacetonate attaches to the silica surface from acetonitrile solution initially as a monolayer, with the subsequent formation of multiple layers as the impregnation solution concentration is increased. The integrated Kubelka-Munk intensities of the supported complexes vary linearly with the concentration of the complex on the support. In the 1700-1300 cm[sup [minus]1] region, the infrared spectrum of the initial layer of the complex on silica is very similar to that of the complex observed in chloroform and bromoform, indicating that hydrogen bonding is the dominant mode of interaction with the surface. The spectrum of the complex in layers above the initial layer can be obtained by subtraction, and appears remarkably similar to that of crystalline Cu(acac)[sub 2]. 60 refs., 9 figs., 2 tabs.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00024a023