75309-24-9Relevant academic research and scientific papers
Polyhedral platinaborane chemistry. Interaction of PMe2Ph with [(PMe2Ph)2PtB10H12]
Bould, Jonathan,Cisarova, Ivana,Kennedy, John D.
, p. 2691 - 2696 (2012)
In solution, [(PMe2Ph)2PtB10H 12] (1) and PMe2Ph exist in dynamic equilibrium with [(PMe2Ph)3PtB10H12] (2). The activation energy for the dynamic process, δG≠, is ca. 63 kJ mol-1 at +17 °C, with δS being ca. 335 J mol-1 deg-1 and δH ca. 105 kJ mol-1 for the equilibrium. At low temperatures a rocking fluxionality of the {Pt(PMe2Ph) 3} unit versus the {η4-B10H12} unit in 2 becomes apparent, with an activation energy δG++ ≠ of ca. 28 kJ mol-1 at ca. -105 °C. Compound 2 is characterized by NMR spectroscopy and by a single-crystal X-ray diffraction analysis, for which the results suggest that, in contrast to the common view, the extra electron pair gained by the metal-atom center in going from 1 to 2 does not disrupt the cluster electron count proper nor the observed nido electronic structure and geometry.
The Reactions of arachno-Decaboranyl Complexes L2B10H12(L= Two-electron Donor Ligand) with some Platinum(II) Compounds; Nuclear Magnetic Resonance Studies and the Crystal and Molecular Structure of
Crook, Janet E.,Greenwood, Norman N.,Kennedy, John D.,McDonald, Walter S.
, p. 2487 - 2496 (2007/10/02)
The reactions of arachno-6,9-(SMe2)2B10H12 and of arachno-6,9-(MeCN)2B10H12 with the complex cis- give moderate yields of the nido-platinaundecaborane which has been characterised by single-crystal X-ray diffraction analysis.Analogous reactions with the dimeric species 2> (R3 = Me3-nPhn'n = 0,1 or 2), by contrast, give the nido-platinaundecaboranes which have been characterized by single-and multiple-resonance n.m.r. spectroscopy.Additional products of the reactions include the arachno nine-vertex species 4-(MeCN)B9H13 and 4-(SMe2)B9H13.
The Chemistry of Isomers of Icosaborane(26), B20H26: Synthesis and Nuclear Magnetic Resonance Study of Various Isomers of Platinahenicosaboranes and Diplatinadocosaboranes, and X-Ray Crystal and Molecular Structures of 7,7-Bis(dimethylphenylphosphine)-nido-7-platinaundecaborane and 4-...
Boocock, Simon K.,Greenwood, Norman N.,Kennedy, John D.,McDonald, Walter S.,Staves, John
, p. 2573 - 2584 (2007/10/02)
An improved synthesis of the known compound has been developed by deprotonation of B10H14 with NNN'N'-tetramethylnaphthalene-1,8-diamine followed by treatment with cis-.This reaction has been applied to the 2,2',2,6', and 1,5'isomers of (B10H13)2 to prepare various isomeric platinahenicosaborane clusters which differ either in the position of the conjuncto-linkage or the site of the platinum atom in the cluster.Appropriate modification of the reaction stoicheiometry in the case of 2,2'-(B10H13)2 led to the isolation of cisoid and transoid diplatinadocosaboranes 2>.The X-ray crystal structure of showed it to contain a platinaundecaborane cluster in which the tetrahapto B10H12 group is twisted by ca. 20 deg with respect to the PtP2 plane.Similarly, the molecular structure of the isomer of 4-B10H11-B10H13)> obtained from 2,2'-(B10H13)2 is distorted by a twist of ca. 8 deg.A detailed n.m.r. study of a number of these clusters has been made, using the resonances of 1H, 11B, 31P, and 195Pt.In addition to permitting structural assignments, the data reveal a novel mutual pseudo-rotation of the η4-B10H11X group (X=H or B10H13) and the (PMe2Ph)2 grouping about the central Pt atom.For the two sets of 1H- methyl resonances at 100 MHz coalesce at 71.5 deg C with an implied activation energy ΔG% of 79 +/- 5 kJ mol-1 for the fluxional process.Similar activation energies were deduced for the various isomers of .
