Synthesis and characterization of new metal(II) complexes with formates and some nitrogen donor ligands

Czakis-Sulikowska, D.; Czylkowska, Agnieszka; Radwanska-Doczekalska, J.; Grodzki, R.; Wojciechowska, Elżbieta

doi:10.1007/s10973-006-7980-9

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…4 and S2) † were interpreted to the partial oxidation and evaporation of ligand (8hq) and co-ligand (bpy or phen) of the complexes formed in the interlayer spaces, as well as final pyrolysis of 8hq and/or coligands and degradation of ZnO. [34][35][36][37] In the DTG curves of the products (Fig. 4), the final stage of the decomposition observed at around 670 • C was ascribed to the oxidation of charcoal and dehydroxydation of the structural OH.…”

Section: Solid-state Intercalation Of Mixed-ligand Zinc(ii)-montmoril...mentioning

confidence: 99%

Formation of mixed-ligand zinc(ii) complex-montmorillonite hybrids by solid–solid reactions

2011

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Two luminescent hybrids, Znqb- and Znqp-montmorillonites (q = 8-hydroxyquinoline, b = 2,2'-bipyridine, p = 1,10-phenanthroline), were prepared by solid-solid reactions between Zn(II)-montmorillonite and two ligands (8-hydroxyquinoline and 2,2'-bipyridine or 1,10-phenanthroline) at room temperature. The intercalation and in situ complex formation of the two ligands into an interlayer space of Zn(II)-montmorillonite were confirmed by powder XRD, TG-DTA, as well as FT-IR, UV-vis and photoluminescence spectroscopies. The emission band of Znqb-montmorillonite was red-shifted compared to that of the mixture of Znq-montmorillonite and Znb-montmorillonite, confirming the formation of Znqb complex in montmorillonite. The photoluminescence intensity of Znqb-montmorillonite was higher than that of Znqp-montmorillonite, indicating that 2,2'-bipyridine enhanced the emission intensity of zinc(8-hydroxyquinoline) complex in montmorillonite, while the coordination of 1,10-phenanthroline quenched the intensity of the immobilized chelate.

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Section: Solid-state Intercalation Of Mixed-ligand Zinc(ii)-montmoril...mentioning

confidence: 99%

Formation of mixed-ligand zinc(ii) complex-montmorillonite hybrids by solid–solid reactions

2011

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“…Recently, much attention has been paid on the study of the interactions of nitrogen, sulphur and oxygen donor atoms containing multidentate ligands with transition metal ions in solution as a result of their capability to exert chelate effects on metal complexes [12]. Amino acids with one or more coordinating groups along with the amino group, NH2, and carboxyl group, CO2H are metal chelants and potential agents in detoxification and remediation of metal pollutants [13].…”

Section: Introductionmentioning

confidence: 99%

Complex Equilibria and Distribution of Metal (II) Ions with Biologically Active Chelating Agents in Aqueous and Aqueous-organic Media

Ishola

Olanipekun

Bolarinwa

et al. 2021

CSIJ

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An understanding of the principles of complex equilibria and species distribution in different solutions is important in expounding and correlating the interaction of different ligands with different metal ions in complex formation. Therefore, acid-base equilibria involved in the formation of binary and ternary complexes of Co (II), Cu (II) and Pb (II) with methionine (Met) and uracil (Urc) have been determined by potentiometric titration technique. The stability constants of the complexes were evaluated at 35 ± 0.1°C and 0.02 M ionic strength (kept constant with NaNO3) in aqueous and organic-aqueous media. The species distribution in solutions as a function of pH was determined using the Hyss program. The stability of the ternary complexes relative to the corresponding binary complexes of the secondary ligand is measured in terms ΔlogK and % RS values. The ternary complexes are observed to be more stable than binary complexes in the media except for [CuMetUrc] ternary complex in organic-aqueous medium where the ternary complex is less stable than the binary complex of the uracil. The overall stability of the ternary complexes was higher in organic-aqueous system than aqueous system. The stability of the complexes was found to be correlated with the covalent index of the metal ions and Jahn Teller distortion. pH-studies of these systems revealed an increase in the concentrations of the ternary complexes with increase in pH. The formation of binary complexes was shown to be favoured in physiological pH range (3-7) while that of the ternary complexes is observed to be favoured in the pH range 5-10.

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“…e ever-increasing importance of ternary complexes especially those involving ligands containing functional groups identical with those present in enzymes, namely, -COOH, -NH 2 , and -CONH, is obvious from the application of such complexes in many analytical and biological reactions [1]. Metal(II), ternary complexes with nitrogen-and oxygen-donor ligands acknowledged ample attention newly, as they may show remarkably high stability [2][3][4]. ese complexes have recently been investigated as of their aptitude as a metal system for metalprotein complexes like metalloenzymes.…”

Section: Introductionmentioning

confidence: 99%

Characterization by Potentiometric Procedures of the Stability Constants of the Binary and Ternary Complexes of Cu(II) and Duloxetine Drug with Amino Acids

Al‐Mohaimeed

Alothman

2019

Journal of Chemistry

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Potentiometric titration method has been used to define stoichiometries and stability constants of ternary complexes of Cu(II) with duloxetine (D) and some selected amino acids (L). The protonation constants of the ligands and the stability constants of the binary and ternary complexes of Cu(II) with the ligands were calculated from the potentiometric data using the HYPERQUAD program. The formation constants of the complexes formed in aqueous solutions and their concentration distributions as a function of pH were evaluated at 25°C and ionic strength 0.10 mol·L−1 NaNO3. Respective stabilities of ternary complexes have been determined compared with the corresponding binary complexes in terms of Δlog K and %R.S. values. A novel binary and ternary duloxetine (D) drug with glycine and its Cu(II) complexes has been synthesized and characterized by several spectroscopic methods. Electronic spectra and magnetic susceptibility measurements reveal square planar geometry for both complexes. The elemental analyses and mass spectral data have justified the [Cu(D)(Gly)] and [Cu(D)Cl(H2O)] composition of complexes, where D = duloxetine and Gly = glycine. The EPR spectra of Cu(II) complexes support the mononuclear structures. Thermal properties and decomposition kinetics of Cu(II) complexes are investigated.

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Synthesis and characterization of new metal(II) complexes with formates and some nitrogen donor ligands

Cited by 12 publications

References 33 publications

Formation of mixed-ligand zinc(ii) complex-montmorillonite hybrids by solid–solid reactions

Formation of mixed-ligand zinc(ii) complex-montmorillonite hybrids by solid–solid reactions

Complex Equilibria and Distribution of Metal (II) Ions with Biologically Active Chelating Agents in Aqueous and Aqueous-organic Media

Characterization by Potentiometric Procedures of the Stability Constants of the Binary and Ternary Complexes of Cu(II) and Duloxetine Drug with Amino Acids

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