A weakly coordinating anion as a tripodal "Br3"-ligand for platinum(IV) - Structure of [(closo-CB11H6Br 6)PtMe3]1
Synthesis, structure, and NMR spectroscopic data for [(closo-CB H Br )PtMe ] are reported. This neutral platinum(IV) complex contains the closo-CB H Br anion bonded to the trimethylplatinum(IV) cation via three boron-bound bromines. Closo-CB H Br , which often acts as weakly coordinating or even non-coordinating anion, adopts here a role still very rare for this anion: it acts as a tripodal capping ligand enabling a pseudo-octahedral geometry at a d6 metal center. Three bromines from the lower hemisphere of the hexahalogenated carboranate coordinate to Pt(IV), and distortions from ideal octahedral angles at Pt are marginal (<3°). Pt-Br bond lengths are 2.7279(18), 2.7129(17), and 2.7671(18) Å. Using the J coupling constant of Pt-bonded methyl groups (79.0 Hz) as indicator of the donor strength of the tripodal cap, the prediction is obtained that closo-CB H Br is a relatively weak donor toward the trimethylplatinum(IV) cation. Ligand competition equilibria can be expected to depend on both the intrinsic donor strengths of competing ligands and on the effects of charge and geometry. We observe that closo-CB H Br is capable of replacing acetone from Me Pt(acetone) , whereas BF counterion is unable to replace acetone under similar conditions. © 2008 NRC Canada. 11 6 6 3 11 6 6 11 6 6 ptH 11 6 6 11 6 6 3 3 4 - - 2 - - + -
Canadian Journal of Chemistry
1 SPEC. ISS.
De Crisci, Antonio G.; Kleingardner, Jesse; Lough, Alan J.; Larsen, Anna; and Fekl, Ulrich, "A weakly coordinating anion as a tripodal "Br3"-ligand for platinum(IV) - Structure of [(closo-CB11H6Br 6)PtMe3]1" (2009). Faculty Articles Indexed in Scopus. 1621.