Crystal structure of M(II) bis-μ-diacetoamidopropionate,diaqua·4H2O (M=Cu,Zn, Co): An uncommon carbonyl-O-of-peptide-coordinated two-dimensional layered polymer |
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| Authors: | Eduardo Zárate M J Gómez-Lara Rubén A Toscano G Negrón A Campero |
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| Institution: | (1) Escuela de Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, C. U., Culiacán, Sin., México;(2) Institute de Química, Universidad Nacional Autónoma de México, Circuito Exterior, C. U., Coyoacán, 04510 México, D. F., México;(3) Universidad Autónoma Metropolitana, Unidad Azcapotzalco; Area de Química, Av. San Pablo, 180 02200 México, D. F., México;(4) Departamento de Química, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Purísima y Michoacán, 09340 México, D. F., México |
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| Abstract: | Crystal and molecular structures by X-ray diffraction analysis of Co, Cu and Zn complexes of 2,2-diacetoamidopropionic acid are reported. The results show that an uncommon bond from metal ion to a carbonyl-O-of-peptide atom is formed. The structures are isomorphic (Monoclinic,P21/c, with two formula units in the cell). The metal ion lies on a center of symmetry and it is six-oxygen coordinated in an octahedral-type configuration by pairs of water molecules, carboxylic (monodentate) groups and two carbonyl-O-of-peptide atoms. Ligand molecules bridge metal ions, so that the structure consists of a two-dimensional (sheet-type) polymer. Sheets are held together by a hydrogen-bond network making efficient use of the solvent water molecules. |
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