Abstract
Metathesis of potassium nido-octahydropentaborate, K[B5H8], with numerous cis-bis(phosphine) complexes of palladium(II) and platinum(II) halides affords cis-[M(B5H8)(PR3)2X] in good yields (X = Cl, Br, I, or Me; PR3= PPh3, PMe2Ph, PMe3, or ½Ph2PCH2CH2PPh2). The platinum complexes are more stable than those of pailadium and can be stored unchanged for long periods at room temperature. Similar reactions with appropriate starting materials lead to cis-[Pt(B5H8)Cl(AsPh3)2], cis-[{Pt(B5H8)(PMe2Ph)(µ-SMe)}2], and the less-stable trans-[Pt(B5H8)I(PMe2Ph)2] and trans-[Pt(B5H8)Me(PMe2Ph)2]. In all cases the B5H8 ligand is η2-bonded to the metal via two of the basal boron atoms B(2) and B(3). Hydrogen-1, 11B, 31P, and 195Pt n.m.r. data for the cis complexes are discussed in terms of the detailed geometrical structure and the nature of the metal–borane bonding.
Published Version
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