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Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes
Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt
* Author to whom correspondence should be addressed.
Received: 7 July 2000; in revised form: 23 August 2000 / Accepted: 20 September 2000 / Published: 31 October 2000
Abstract: 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
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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.
Souaya ER, Hanna WG, Ismail EH, Milad NE. Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes. Molecules. 2000; 5(10):1121-1129.
Souaya, E. R.; Hanna, W. G.; Ismail, E. H.; Milad, N. E. 2000. "Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes." Molecules 5, no. 10: 1121-1129.