Synthesis and solid state structure of Co(II) complexes of OPTA

The addition of 1,3,5-triaza-7-phosphaadamantane (PTA) to CoCl2 · 6H2O results in oxidation of phosphorus to the phosphine oxide (OPTA). Isolated from this reaction are the first metal complexes of OPTA, [PTAH](OPTACoCl3) (1) and [Co(OH2)3(OPTA)(OPTACoCl3)2] (2). Both 1 and 2 have been crystallographically characterized and involve nitrogen coordination to a CoCl3- fragment. Complex 2 contains both an octahedral Co(II) center, with three facial aquo and three facial OPTA ligands bound via oxygen. In addition, tetrahedral Co(II) centers are coordinated to two of the OPTA ligands via nitrogen.

Reactivity of the water-soluble phosphine 1,3,5-triaza-7-phosphaadamantane (PTA) with CoCl2 is described. During reaction PTA is oxidized leading to the first metal complexes of OPTA.Figure optionsDownload as PowerPoint slide