Preparation and crystal structure of the hydroxo-bridged complex biscyclo-tri-μ-hydroxo-tris[(trans-1,2-diaminocyclohexane)platinum(II)] tris |
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Authors: | Jean-Pierre Macquet Suzy Cros André L Beauchamp |
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Institution: | Laboratoire de Pharmacologie et de Toxicologie Fondamentales du C.N.R.S., Toulouse, France;Département de Chimie, Université de Montréal, Canada |
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Abstract: | The title compound, C18H45N6O3Pt3]2(SO4)3·14H2O, belongs to space group C2/c, with a = 25.90(2) Å, b = 14.33(2) Å, c = 23.74(3) Å, β = 122.88(7)°, and Z = 4. The structure was refined on 2899 independent nonzero reflections to an R factor of 0.042. The crystal contains hydroxobridged cyclic Pt3(OH)3(C6H14N2)3]3+ ions, in which the Pt3O3, ring has a chair conformation. The coordination around each Pt atom is square planar and the cyclohexyl ring lies roughly in the same plane. A large cavity between two trimeric ions related by a twofold axis is filled with one SO42- ion and five water molecules, which participate in an intricate network of hydrogen bonds among themselves and with the hydroxo and amino groups of the complex cation. These units are held together in the crystal by stacking interactions between Pt(OH)2(C6H14N2) “planes” belonging to adjacent molecules, as well as by hydrogen bonds involving the remaining SO42- ions and water molecules. The presence of the cyclohexane ring precludes λ-δ interconversion in the chelate ring and imparts rigidity to the Pt(trans-dach)2+ unit. |
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