The reaction of diphenyl ditelluride with triosmium clusters

摘要

The reaction of Ph2Te2 with Os-3(CO)(10)(CH3CN)(2) at room temperature gave the cluster Os-3(CO)(10)(mu-TePh)(2) 1, in which one TePh bridges an "open" Os ... Os edge and another bridges an Os-Os bond. Thermolysis of 1 in refluxing cyclohexane led to isomerisation of 1 to 2, in which both TePh moieties bridge the same "open" Os ... Os edge; thermolysis of 2 in refluxing octane led to the cluster Os-3(CO)(9)(mu(3)-Te)(2) 3. The reaction of Ph2Te2 with Os-3(mu-H)(2)(CO)(10), on the other hand, resulted in a complex mixture of products among which were the clusters Os3H2(CO)(10)(mu-TePh)(2) 4 and Os-3(mu-H)(CO)(10)(mu-TePh) 5; cluster 5 was also obtained in moderate yield from the reaction with [Os-3(mu-H)(CO)(10)(mu-CO)](-). Cluster 4 comprises a four-membered Os2Te2 ring, with an HOs(CO)(4) fragment attached to one of the osmium atoms; it decomposed on silica gel to afford the dinuclear compound [OsH(CO)(3)(TePh)](2) 6. The clusters 1-6 have all been characterised by single crystal X-ray crystallography. [References: 30]