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An Infrared Study on the Chemisorption of Tertiary Phosphines on Coinage and Platinum Group Metal Surfaces by Gunnar Westermark; Hans Kariis; Ingmar Persson; Bo Liedberg is a Materials Science article available to read on EtoBox.

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The chemisorption of dimethylphenyl-, methyldiphenyl-and triphenylphosphine on evaporated gold, silver, copper, rhodium, iridium, palladium, platinum and nickel surfaces has been studied by means of infrared reflection -absorption spectroscopy (IRAS). Multilayers of physisorbed phosphine are formed on the surfaces of all metals studied except nickel after deposition from dilute toluene solution. The deposition rate varies for different metal surfaces and it is sometimes quite slow. The standard immersion time was 20 h in this study to secure that an equilibrium between the surface and the solution is reached. Several minutes of ultrasonic treatment are required to get rid of the physisorbed phosphine, leaving a very thin layer of chemisorbed phosphine on the metal surface. Most of the absorption bands in IRAS spectra of these thin layers show significant shifts, which are especially large for dimethylphenylphosphine. It is evident that the electron distribution in the entire phosphine molecules is changed and that the chemisorption to the coinage and platinum group metal surfaces is strong. Infrared spectra of coordination compounds of gold(I), silver(I) and copper(I) with dimethyl

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Author

Gunnar Westermark; Hans Kariis; Ingmar Persson; Bo Liedberg

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)