1. Adsorption of Diisocyanides on Gold
- Author
-
Thomas Bein, Sue Feng, Jason I. Henderson, and Clifford P. Kubiak
- Subjects
chemistry.chemical_classification ,Chemistry ,Isocyanide ,Aryl ,Surfaces and Interfaces ,Condensed Matter Physics ,Contact angle ,chemistry.chemical_compound ,Crystallography ,Adsorption ,Ellipsometry ,Monolayer ,Electrochemistry ,Organic chemistry ,General Materials Science ,Absorption (chemistry) ,Spectroscopy ,Alkyl - Abstract
Four known diisocyanides, 1,6-diisocyanohexane (1), 1,12-diisocyanododecane (2), 1,4-phenylenediisocyanide (3), 4,4‘-biphenyldiisocyanide (4), and two new diisocyanides, 4,4‘ ‘-p-terphenyldiisocyanide (5) and 1,4-di(4-isocyanophenylacetelynyl)-2-ethylbenzene (6), were used to prepare self-assembled monolayers (SAMs) on gold. The SAMs were characterized by ellipsometry, by measurement of the advancing water droplet contact angle, and by reflection absorption infrared (RAIR) spectroscopy. SAMs prepared from the diisocyanides 1 and 2, which have a flexible alkyl chain between the two isocyanide end groups, were found to form monolayer films in which both isocyanide groups are bound to the surface. SAMs prepared from the diisocyanides 3−6, which have rigid aryl or phenylethynyl structures between the two isocyanide end groups, were found to bind to gold through one CN group. Analyses of the RAIR spectra of these SAMs are consistent with surface selection rules for adsorbates that are oriented with their long ...
- Published
- 2000