Journal of the Chemical Society, Dalton Transactions p. 1261 - 1268 (1993)
Update date:2022-08-03
Topics:
Stibr, Bohumil
Jelinek, Tomas
Kennedy, John D.
Fontaine, Xavier L. R.
Thornton-Pett, Mark
Reaction between a = 1186.8(1), b = 1554.1(2), c = 1344.1(2) pm, β = 95.02(1) deg and Z = 4.The structure refined to R,R'= 0.0297, 0.0310 using 3938 data with I > 3?(I).The cluster structure is of the nido eleven-vertex type, with the platinum and carbon atoms occupying adjacent positions on the open face.There is some geometrical closure from pure nido, so that the gross cluster structure tends towards intermediacy between those of <7,7-(PMe2Ph)2-nido-7-PtB10H12> 4 and of the closo-structured species <1,1-(PMe2Ph)2-1,2,3-PtC2B8H10> 3.The NMR properties of 1 are reported and assessed for intermediacy between those of 3 and 4, and the analytical utility of NMR spectroscopy in assessing the metal-to-cluster bonding is developed by comparison with non-metallated species.The metal-to-carborane bonding sphere of compound 1 is fluxional, with ΔG(excit.)313 ca. 62 kJ mol1.The fluxional process involves and interconversion of enantiomers with the platinum centre and the bridging hydrogen atom migrating around the open face of the a half-twist.
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