An Investigation of the Chemistry of Molybdenum Hexacarbonyl on Thin Dehydroxylated Alumina Films in Ultrahigh Vacuum

The Surface Chemistry of Propylene, 1-Iodopropane, and 1,3-Diiodopropane on MoAl Alloy Thin Films Formed on Dehydroxylated Alumina

“…Infrared data were collected with a Bruker Equinox infrared spectrometer equipped with a liquid nitrogen cooled, mercury cadmium telluride detector operated at 4 cm -1 resolution and data were typically collected for 1000 scans. The complete light path was enclosed and purged with dry, CO 2 -free air. , …”

“…The complete light path was enclosed and purged with dry, CO 2 -free air. 15,16 The Mo(100) substrate (1 cm diameter, 0.2 mm thick) was cleaned by using a standard procedure, which consisted of argon ion bombardment (2 kV, 1 µA/cm 2 ), and any residual contaminants were removed by briefly heating to 2000 K in vacuo. The resulting Auger spectrum showed no contaminants.…”

“…[13][14][15][16] Our recent studies have shown that reacting Mo(CO) 6 with aluminum 17 and dehydroxylated and hydroxylated alumina 18,19 thin films at 700 K deposits molybdenum carbide incorporating a small amount of oxygen. Reaction of low exposures of Mo(CO) 6 with an alumina thin film results in the formation of small molybdenum carbide particles on the surface, while higher exposures (∼5000 L of Mo(CO) 6 ) lead to a thin carbide film that completely covers the surface.…”

“…Mo(CO) 6 has been extensively used as a catalyst precursor − and more recently to generate model catalysts grown on planar alumina thin films in ultrahigh vacuum, where surface-sensitive analytical techniques can be used. − Our recent studies have shown that reacting Mo(CO) 6 with aluminum and dehydroxylated and hydroxylated alumina , thin films at 700 K deposits molybdenum carbide incorporating a small amount of oxygen. Reaction of low exposures of Mo(CO) 6 with an alumina thin film results in the formation of small molybdenum carbide particles on the surface, while higher exposures (∼5000 L of Mo(CO) 6 ) lead to a thin carbide film that completely covers the surface .…”

Formation and Decomposition of C3 Metallacycles from Ethylene and Methylene on MoAl Alloy Thin Films

“…The complete light path was enclosed and purged with dry, CO 2-free air. 44,45 The Mo(100) substrate (1 cm diameter, 0.2 mm thick) was cleaned using a standard procedure, which consisted of argon ion bombardment (2 kV, 1 µA/cm 2 ) and any residual contaminants were removed by briefly heating to 2000 K in vacuo. The resulting Auger spectrum showed no contaminants.…”