78497-84-4Relevant academic research and scientific papers
SYNTHESIS, MOLECULAR STRUCTURE, AND NUCLEAR MAGNETIC RESONANCE INVESTIGATION OF THE PLATINANONABORANE AND DIPLATINADECABORANE CLUSTER COMPOUNDS. AND
Boocock, Simon K.,Greenwood, Norman N.,Hails, Michael J.,Kennedy, John D.,McDonald, Walter S.
, p. 1415 - 1429 (1981)
The reaction of cis- with an excess of - gives 4,4-bis(dimethylphenylphosphine)-arachno-4-platinanonaborane, , (I), in high yield.The pale yellow crystals are monoclinic, space group C2/c, with a = 1.9771(8), b = 1.3025(4), c = 1.9773(4) nm, β = 110.99(3) deg, Z = 8, and the molecular structure is that of a nine-vertex arachno-platinanonaborane in which the B8 unit shows trihaptobonding to the metal centre.The compound is also formed in lower yield from several other polyhedral borane derivatives.The 14-vertex bis(dimethylphenylphosphine)bis-μ-(2-4-η-nido-hexaboranyl)-diplatinum(Pt-Pt), , is also formed in moderate yield from the - reaction, and this offers the most convenient route yet established for preparation.Treatment of (I) with KOH followed by cis- gives the very stable diplatinum compound 6,6,9,9-tetrakis(dimethylphenylphosphine)-arachno-6,9-diplatinadecaborane, , (II).The colourless crystals are monoclinic, space group C2/c, with a = 1.3762(3), b = 1.5105(4), c = 1.9210(3) nm, β = 92.59(2) deg, and Z = 4; the molecular structure is that of an arachno-diplatina-decaborane anion 2-.The 1H, 11B, 31P, and 195Pt n.m.r. behaviour of both title compounds has been investigatedin detail using both single and double resonance techniques, and a number of important structural correlations emerge.
Reactions of 6,6'-Bis(nido-decaboranyl) Oxide and 6-Hydroxy-nido-decaborane with Dihalogenobis(phosphine) Complexes of Nickel , Palladium, and Platinum, and some Related Chemistry; Nuclear Magnetic Resonance Investigations and the Crystal and Molecular Structures of Bis(dimethylphosph...
Greenwood, Norman N.,Hails, Michael J.,Kennedy, John D.,McDonald, Walter S.
, p. 953 - 972 (2007/10/02)
A modified procedure for the preparation and isolation of 6,6'-(B10H13)2O leads also to the isolation of the new compound 6-B10H13OH, which has been fully characterised by 11B and 1H n.m.r. and mass spectroscopy.The structures and some chemistry of these two related oxyboranes are compared.The reaction of either 6,6'-(B10H13)2O or 6-B10H13OH with cis- (L = PMe2Ph or PPh3) gives three platinaboranes, arachno- (1), nido-, and 3-B6H9)2L2> (2).The yellow needles of (2) (L = PMe2Ph) are monoclinic, space group P21/c, with a = 1014.0(2), b = 586.8(2), c = 2316.9(6) pm, β = 91.66(2) deg, Z = 2 and the molecular structure is that of a centrosymmetric 14-vertex arachno-diplatinaborane in which two B6H9 clusters are bonded above and below an almost linear P-Pt-Pt-P system.The bonding of each B6H9 unit is symmetrical trihapto.In sharp contrast the reaction of 6,6'-(B10H13)2O with the corresponding nickel complex cis- gives mainly phosphine-boranes of known type, viz.PhMe2P*BH3, PhMe2P*B3H7, and PhMe2P*B9H13, together with a low yield of the new metallaborane closo- (3).The red crystals of (3) are monoclinic, space group C2/c, with a = 1341.2(2), b = 1321.5(2), c = 1476.3(2) pm, β = 109.50(1) deg, Z = 4 and the molecular structure is that of a bicapped square antiprismatic 10-vertex closo-nickelaborane in which the Ni(PMe2Ph)2 group takes up a capping four-connected site.The reaction of 6,6'-(B10H13)2O with cis- (L = PMe2Ph or PPh3) gives phosphine-boranes analogous to those from the reaction with cis-, together with arachno-, the palladium analogues of (1).Treatment of (1) with KH followed by cis- gives the moderately stable heterodimetallaborane cluster compound, , an arachno-palladaplatinaborane species and the first metallaborane of any kind to contain metals from two different periods in the Periodic Table.Treatment of (2) with base followed by cis- gives the 15-vertex trimetallaborane cluster compound 3-B6H9)(μ-(η3-B6H8-η2-PtH(PMe2Ph)2))(PMe2Ph)2>.The 1H, 11B, and 31P n.m.r. behaviour of these compounds have been investigated in detail using both single- and double-resonance techniques, and a number of interesting patterns emerge.
