Coordination chemistry of iminodiacetic esters. Structural and spectroscopic characterization of copper (II) and zinc (II) monoethyliminodiacetato complexes
Por:
Guevara-García J.A., Barba-Behrens N., Tapia-Benavides A.R., Rosales-Hoz M.J., Contreras R.
Publicada:
1 ene 1995
Resumen:
The dimethylester of iminodiacetic acid (NH(CH2CO2CH32) reacts with CuCl2·2H2O 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, P21/c, a = 13.690(5), b = 5.275(4), c = 14.811(5) A ?, ? = 106.57(3)°, Z = 4, final R = 0.034 and Rw = 0.038 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. © 1995.
Filiaciones:
Departamento de Química Inorgánica, División de Estudios de Posgrado, Facultad de Química, C.U., 04510 Mexico, D.F., Mexico
Departamento de Química, Centro de Investigación y Estudios Avanzados, IPN, Apdo. Postal 14-740, 07000 Mexico, D.F., Mexico
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