Mixed-Ligand Complexes of Some Metal Ions with N-(2-Acetamido)Iminodiacetic Acid and Salicylic Acid Derivatives: Synthesis, Solution Equilibria and Characterization Studies

Synthesis and Equilibrium Studies of Mixed‐Ligand Complexes of Co(II), Ni(II), and Cu(II) with Some Aliphatic Dicarboxylic Acids and Creatinine

“…The bands in the 2990-2900 cm 21 range (medium to weak) could be assigned to the C-H stretching vibrations in both primary and secondary ligands. The n(C5 5O) bands of creatinine were observed in the range 1710-1690 cm 21 showing that the C5 5O groups of creatinine are not involved in the coordination. The assignment of this band is in a good agreement with those previously reported for creatinine on the basis of characteristic vibrations.…”

“…[10] A distinct band appearing in the 1640-1600 cm 21 region in all complexes is typical of coordination carboxylate stretching. [26] This assignment is based on the fact that the ionized and coordinated COO 2 stretching band appears [26] at 1650-1590 cm 21 . The fact that the band appeared in the 1450 -1400 cm 21 range is likely ascribed to the symmetric vibration of the coordinated carboxylates.…”

Solution Equilibria of Binary and Ternary Systems Involving Transition Metal Ions, Adenosine 5‘-Triphosphate, and Amino Acids

“…Moreover, no studies appear to have been made on the ternary systems of the trivalent transition metal ions containing ATP and amino acid ligands. Continuing our studies on the mixed ligand complexes (Ahmed et al, 1996(Ahmed et al, , 1997(Ahmed et al, , 1998, this paper represents a systematic potentiometric study on the complex formation between some transition metal ions (Cu II , Ni II , Co II , La III , and Ce III ) and adenosine 5′-triphosphate, in the form of the disodium salt (H 2 L) 2-, as a primary ligand and some monocarboxylic as well as dicarboxylic amino acids (proline, lysine, histidine, asparagine, glutamine, aspartic acid, and glutamic acid) as secondary ligands in aqueous media at (25 ( 0.1)°C. The structures of the ligands used in this study are…”

Thermal decomposition study on mixed ligand thymine complexes of divalent nickel(II) with dianions of some dicarboxylic acids

“…Characterization of isolated ternary complexes 3.1.1. Infrared spectra IR spectra of the metal complexes reveal the presence of OH for hydrated and coordinated water molecules, at 3505-3490 and 3330-3250 cm À1 [31]; NH 2 group of amino acids, at 3140-3110 cm À1 [32]; C O absorption of thymine, at 1715-1710 cm À1 and 1690-1680 cm À1 [8]; NH bands of thymine, at 3060-3000 cm À1 [8]; C O group of ADA, at 1690-1670 cm À1 [24,31,33]; ionized coordinated carboxylate group band, at 1610-1580 cm À1 [31].…”

“…In our recent publications, we have reported the interaction of various metal ions with N-(2-acetamido)iminodiacetic acid [24], 8-hydroxyquinoline [25,26], creatinine [27], and thiosemicarbazide as well as dithiocarbazate derivatives [28], however thermal decomposition of such complexes was beyond the scope of these publications. Therefore, the present work is devoted to characterize the thermal decomposition of Ni(II)-ternary complexes with dicarboxylic amino acids (aspartic, glutamic) or N-(2-acetamido)iminodiacetic acid and thymine.…”