Unusually facile dissociation of benzene by ruthenium metal

Partial Gas Phase Hydrogenation of Benzene on Sol-Gel Ruthenium Catalysts

“…This deactivation is caused by adsorption of dehydrogenated species on the ruthenium surface. These dehydrogenated species are formed by abstraction of hydrogen from benzene molecules [7,12]. Under the same reaction conditions the activity of an impregnation catalyst decreases more rapidly with a half-life of about 15 min [8].…”

The Molecular Structure of [Os3Rh4(μ3‐η1:η1:η1‐C6H5CH3)(CO)13]: A Face‐Capping Bonding Mode for Arenes in Organometallic Clusters

“…Purification by TLC on silica using hexane: CH 2 Cl 2 (2:1 v/v) as eluent yielded complex 1 as a brown solid in 10 % yield (14.4 mg, 0.01 mmol). The major product isolated from the reaction was [Os 5 Rh 2 (m-CO)(h 6 -C 6 H 5 CH 3 )(CO) 16 ] [19] (6), C15-C14-C19 120(2), C14-C15-C16 122(2), C15-C16-C17 115(1), C16-C17-C18 117(2), C17-C18-C19 123(2) and C14-C19-C18 120(2), C14-C19-C20 117(2), C18-C19-C20 119 (2). presence of isomers 1 a (m 3 -h 2 :h 2 :h 2 ) and 1 b (m 3 -h 1 :h 1 :h 1 ) in a ratio of approximately 2:3.…”

“…[2] A number of adsorption sites for benzene on atomically planar metal surfaces such as the (111) face of face centered cubic (fcc) packing and the (0001) face of hexagonal centered packing (hcp) have been identified, [3] (Figure 1). This type of compound also plays an important role in homogeneous catalytic processes, such as, the hydrogenation of benzene to cyclohexane.…”

“…[1] The determination of the adsorption geometry of arenes on metal surfaces can give insights into the elementary steps of the dissociation and catalytic reactions of these molecules. [2] A number of adsorption sites for benzene on atomically planar metal surfaces such as the (111) face of face centered cubic (fcc) packing and the (0001) face of hexagonal centered packing (hcp) have been identified, [3] (Figure 1). This type of compound also plays an important role in homogeneous catalytic processes, such as, the hydrogenation of benzene to cyclohexane.…”

“…[11] A closely related molecular system with C 3v (s v ) is also known for the [{(C 5 Me 5 )Ru} 3 (m-H) 3 (m 3 -h 3 :h 3 -C 6 H 6 )] 2+ ion, however, the interaction of the C 6 ring to the triangular metal framework is not symmetrical. [12] The average vertical distance between carbon atoms and the Rh 3 plane in 1 is 2.21 (2) . This is almost 0.1 longer than that observed in the Ru/ benzene system (2.11(4) ) when studied with the LEED technique, [3] although the difference is not statistically significant because of the low accuracy of surface studies.…”