Acidic 1,3-propanediaminetetraacetate zinc complexes as a probe of water soluble coordination polymers |
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| Authors: | Mao-Long Chen |
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| Institution: | College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Xiamen University, Xiamen 361005, China |
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| Abstract: | In a very acidic solution, potassium 1,3-propanediaminetetraacetate zinc chloride K2nZnCl2(1,3-H2pdta)ZnCl2]n (1) and its substituted iodide ZnI2(H2O)(1,3-H4pdta)]n (2) (H4pdta = 1,3-propanediaminetetraacetatic acid, C11H18N2O8) were isolated. The former was obtained from the reaction of zinc chloride and H4pdta in pH ∼1.5. Further substitution of 1 results in the formation of iodide 2 with the addition of potassium iodide in acidic solution of pH 0.5. Complex 1 consists of a dimeric anionic unit ZnCl2(1,3-H2pdta)ZnCl2]2− with strong intra-molecular hydrogen bonds N1?O2 2.648(4); N1?O4 2.710(4) Å]. In neutral complex 2, an 1,3-pdta ligand links each monomeric unit Zn(H2O)I2] to generate an infinite 1D chain, which extents into a 3D supramolecular structure by very strong inter-molecular hydrogen bonds the O4?O2b 2.50 (1) Å, bx, y, z + 1]. 1 is soluble in water at room temperature, which is traced by 13C NMR experiment. |
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| Keywords: | Zinc 1 3-Propanediaminetetraacetic acid Crystal structure Chloride Iodide |
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