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

Studies On Some Acid Divalent-Metal Nitrilotriacetate Complexes

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Received: 7 July 2000 / Revised: 23 August 2000 / Accepted: 20 September 2000 / Published: 31 October 2000
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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 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.

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