Reactions of 1,2,3-triphenyl-1,2,3-triphosphaindan with activated triosmium carbonyl clusters: characterization and crystal structure of the products
Abstract
Reaction of 1,2,3-triphenyl-1,2,3-triphosphaindan (I) with [Os3(CO)11(NCMe)] at room temperature afforded two clusters: mono-substituted trinuclear [Os3(CO)11{1-C6H4(PPh)3}] 1 and bridged bis-trinuclear [{Os3(CO)11}2{μ-1,3-η2-C6H4(PPh)3}] 2, which can also be prepared by further reaction of 1 with an equimolar amount of [Os3(CO)11(NCMe)]. The reaction at 100 °C gave, apart from cluster 2, a di-substituted bridged cluster, [Os3(CO)10{μ-1,3-η2-C6H4(PPh)3}] 3, and that at 140 °C formed a linked pentanuclear cluster, [Os2(CO)6{μ3-η3-PPhC6H4(PPh)2}Os3(CO)11] 4 and a trinuclear cluster with only two M–M bonds, [Os3(CO)9{μ3-η3-PPhC6H4(PPh)2}] 5 together with 3. Similarly [Os3(CO)10(NCMe)2] reacted with I at room temperature to afford 3 in good yields. The conversion of cluster 1 into 3 can be achieved through