J. A. Guevara-García, N. Barba-Behrens, A. R. TapiaBenavides, M. J. Rosales-Hoz and R. Contreras, Coordination Chemistry of Iminodiacetic Dimethylester. Structural and Spectroscopic Characterization of Copper(II) and Zinc(II) Monoethyliminodiacetate Complexes, . Inorg. Chim. Acta. 239, 93-97 (1995). DOI: http://dx.doi.org/10.1016/0020-1693(95)04718-2
The dimethylester of iminodiacetic acid (NH(CH2CO2CH32) reacts with CuCl22H2O and ZnCl2 in aqueous ethanol to yield [Cu(idae)Cl(H2O)] (I) and [Zn(idae)Cl(H2O)] (II), respectively idae = O-ethyliminodiacetato). In both compounds the original ligand is monohydrolyzed and transesterificated by ethanol. When the reaction with copper chloride was carried out in methanol the corresponding methylmonoester copper compound, [Cu(idam)Cl(H2O)] (III) (idam = O-methyliminodiacetato), was the reaction product. The X-ray diffraction structure of compound I was obtained. It crystallizes in the monoclinic system, for 1456 observed independent reflections. The copper (II) atom is in a distorted octahedral geometry, with a fac coordination of the ligand. A chloride ion, a water molecule and a carboxylate oxygen from another molecule complete the coordination sphere. The compound presents a monodimensional zig-zag chain structure where the carboxylate oxygen of one ligand bridges two adjacent copper atoms. The chirality of the N and Cu atoms alternates in the chains. The zinc compound II was characterized by TGA and IR, 13C and 1H NMR spectroscopic methods, and presented a similar structure to compound I.