Doris Melgarejo -  The neutral cluster,4,6-triazabicyclo[3.3.0]oct-4-ene) tetracopper(II).

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  Publication Details (including relevant citation   information):

  Acta Crystallographica, Section C: Crystal Structure   Communications  (2009),  C65(6),  m228-m230.   Chiarella, Gina M.; Melgarejo, Doris Y.; Fackler, John P., Jr.


  The title compd., [Cu4Cl6O(C5H9N3)3(NH3)], is a neutral   conformationally chiral cluster which crystallizes under the   conditions described in this paper as a racemic   conglomerate.  It contains four CuII atoms in a tetrahedral   coordination with a central O atom lying on a crystallog. 3-fold   axis.  Six chloride anions bridge the four CuII atoms.    Three CuII atoms are bound by an N atom of a monodentate   1,4,6-triazabicyclo[3.3.0]oct-4-ene (Htbo) ligand and the   remaining CuII atom is bound by a terminal ammine ligand.    The geometry at each Cu center is trigonal bipyramidal, produced   by the bound N atom of Htbo or NH3, the O atom in the axial   position, and three chloride ions in the equatorial plane.    The chloride anions form an octahedron about the O center.    The Cu-NH3 bond lies along the crystallog. 3-fold axis, along   which the mols. are packed in a polar head-to-tail fashion.    Crystallog. data are given.

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