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Molecules 2000, 5(10), 1121-1129; doi:10.3390/51001121

Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes

, * ,  and
Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt
* Author to whom correspondence should be addressed.
Received: 7 July 2000 / Revised: 23 August 2000 / Accepted: 20 September 2000 / Published: 31 October 2000
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IR and 1H-NMR studies on nitrilotriacetic acid (H3NTA) suggest that the acid exists in the zwitterion form, which allows the existence of intermolecular hydrogen bonding. A tetrahedral structure is established for eleven (1:1) anhydrous acid-metal (II) nitrilotriacetates complexes. The ten Dq values for the colored complexes were determined spectrophotometrically. The pKa values for the eleven acid metal complexes [M(HNTA)].(OH2)3] were determined and compared with the corresponding pKa values of the [M(OH2)n]+2 ions and also with the log β1 values of the corresponding [M(NTA)]- complexes. X-ray diffraction studies on the ligand and on eight of these complexes are described.
Keywords: nitrilotriacetic acid; nitrilotriacetates complexes; pKa values; X-ray diffraction nitrilotriacetic acid; nitrilotriacetates complexes; pKa values; X-ray diffraction
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Souaya, E.R.; Hanna, W.G.; Ismail, E.H.; Milad, N.E. Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes. Molecules 2000, 5, 1121-1129.

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