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A copper(II) paddle-wheel structure of tranexamic acid: di-chloro-tetra-kis-[μ-4-(ammonio-meth-yl)cyclo-hexane-1-carboxyl-ato-O,O']dicopper(II) dichloride hexa-hydrate.

  • Altaf M Center of Excellence in Nanotechnology, King Fahd University of Petroleum, & Minerals, 31261 Dahran, Saudi Arabia.
  • Stoeckli-Evans H Institute of Physics, University of Neuchâtel, rue Emile-Argand 11, CH-2000 Neuchâtel, Switzerland.
  • 2017-12-19
Published in:
  • Acta crystallographica. Section E, Crystallographic communications. - 2017
anti­fibrinolytic amino acid
copper(II)
crystal structure
fibrinolytic inhibitor
hydrogen bonding
paddle-wheel
tranexamic acid
English Tranexamic acid [systematic name: trans-4-(amino-meth-yl)cyclo-hexane-1-carb-oxy-lic acid], is an anti-fibrinolytic amino acid that exists as a zwitterion [trans-4-(ammonio-meth-yl)cyclo-hexane-1-carboxyl-ate] in the solid state. Its reaction with copper chloride leads to the formation of a compound with a copper(II) paddle-wheel structure that crystallizes as a hexa-hydrate, [Cu2Cl2(C8H15NO2)4]2+·2Cl-·6H2O. The asymmetric unit is composed of a copper(II) cation, two zwitterionic tranexamic acid units, a coordinating Cl- anion and a free Cl- anion, together with three water mol-ecules of crystallization. The whole structure is generated by inversion symmetry, with the Cu⋯Cu axle of the paddle-wheel dication being located about a center of symmetry. The cyclo-hexane rings of the zwitterionic tranexamic acid units have chair conformations. The carboxyl-ate groups that bridge the two copper(II) cations are inclined to one another by 88.4 (8)°. The copper(II) cation is ligated by four carboxyl-ate O atoms in the equatorial plane and by a Cl- ion in the axial position. Hence, it has a fivefold O4Cl coordination sphere with a perfect square-pyramidal geometry and a τ5 index of zero. In the crystal, the paddle-wheel dications are linked by a series of N-H⋯Cl hydrogen bonds, involving the coordinating and free Cl- ions, forming a three-dimensional network. This network is strengthened by a series of N-H⋯Owater, Owater-H⋯Cl and Owater-H⋯O hydrogen bonds.
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  • English
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gold
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https://sonar.ch/global/documents/278200
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