Crystal Structure of a Mixed-ligand Complex of Copper(II), 1,10-phenanthroline, and Glycylglycine Dianion: Glycylglycinato(1,10-phenanthroline)copper(II) Trihydrate
The crystal and molecular structures of glycylglycinato(1,10-phenanthroline)copper(II) trihydrate has been determined by single-crystal x-ray diffraction, using counter methods. In the mixed Cu(II) complex glycylglycine serves as a terdentate ligand with amino, ionized amide nitrogen, and carboxylate oxygen donor atoms approximately tetragonally disposed about Cu(II). The fourth tetragonal position about Cu(II) is occupied by one phen nitrogen atom while the other more distant nitrogen occupies a tilted apical position resulting in an overall distorted square-pyramidal geometry about Cu(II). The individual complex molecules are hydrogen bonded to their neighbors via the three water molecules, forming a polymeric hydrogen-bonded lattice. Visible absorption spectra results suggest that the structure found in the crystal persists in aqueous solution near pH 9. Crystal data: CuO6N4C16H20, space group P1, Z = 2, a = 7.842 (1) Å, b = 9.395 (2) Å, c = 13.763 (4) Å, α = 74.64 (2)°, β = 72.00 (2)°, γ = 75.76 (2)°, V = 915 Å3, R = 3.1%, 1664 reflections.
M. Lim et al., "Crystal Structure of a Mixed-ligand Complex of Copper(II), 1,10-phenanthroline, and Glycylglycine Dianion: Glycylglycinato(1,10-phenanthroline)copper(II) Trihydrate," Inorganic Chemistry, American Chemical Society (ACS), Jan 1976.
The definitive version is available at http://dx.doi.org/10.1021/ic50158a014
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© 1976 American Chemical Society (ACS), All rights reserved.