Abstract
Abstract The crystal structure of bis(N-acetyglycinato) diaquocopper(II) dihydrate was determined by X-ray diffraction studies and was refined by least-squares methods to R = 3.7% for 1565 reflections measured. The compound is monoclinic, space group C2/c. The unit cell parameters are a = 21.145(6), b= 5.046(2), c = 18.248(5) A , β =127.55(4), V = 1543.7 A ; d c = 1.582, d m = 1.57 g cm −3 , Z = 4. The molecules is centrosymmetric with the copper atom being surrounded by two oxygen atoms of the water molecules and two oxygen atoms of the carboxylate groups in a square planar arrangement with CuO distances of 1.944(2) and 1.952(2) A , respectively. Two much longer out-of-plane CuO bonds to the remaining oxygen atoms of the carboxyl groups (2.619(2) A ) complete a distorted square bipyramidal coordination of the metal atoms. The angle between this long CuO vector and the normal to the square plane is 36.4°. The remaining two water molecules are involved in hydrogen bonding with the bonded water molecules and the peptide oxygen of the ligand.
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