[Co{Ph2P(O)CH2P(O)Ph-2}(3)][CoCl4] center dot 8CHCl(3): Crystal structure and formation from [Co-2(Ph2PCH2PPh2)(CO)(6)] in chloroform

摘要

When a solution of [Co-2(Ph2PCH2PPh2)(CO)(6)] in chloroform or deuterochloroform is allowed to stand in air at room temperature, it deposits dark green crystals of [Co{Ph2P(O)CH2P(O)Ph-2}(3)][CoCl4]center dot 8CHCl(3). The same product is formed more quickly and in much higher yield (80% based on Co) if the reaction is carried out in the presence of 2 equiv. of [Ph2PCH2PPh2]; the Co-II appears to catalyse the air-oxidation of [Ph2PCH2PPh2]. The salt was characterised by X-ray crystallography and shown to contain octahedral Co-II cations and Coll tetrahedral anions having normal bond lengths and angles. (c) 2006 Elsevier B.V. All rights reserved.