Ternary complexes of nickel(II) withAMP,ADP andATP as primary ligands and some biologically important polybasic oxygen acids as secondary ligands

Azab, Hassan A.; Hassan, Ahmed I.; El-Nady, A. M.; Azkal, R. S. A.

doi:10.1007/bf00810582

Cited by 25 publications

(18 citation statements)

References 30 publications

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“…Thus, the secondary ligand, Z, combines with the binary 1: 6 ] 2+ " in solutions. Thus, the initial estimates of the stability constants of the normal ternary complexes formed in solution have been determined using the Irving and Rossotti formula.…”

Section: Resultsmentioning

confidence: 99%

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Role of Biologically Important Zwitterionic Buffer Secondary Ligands on the Stability of the Mixed-Ligand Complexes of Divalent Metal Ions and Adenosine 5‘-Mono-, 5‘-Di-, and 5‘-Triphosphate

2001

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Potentiometric equilibrium measurements have been performed at (25.0 ( 0.1)°C and ionic strength I ) 0.1 mol dm -3 KNO 3 for the interaction of the purine nucleotides adenosine 5′-mono, 5′-di, and 5′-triphosphate and Cu(II), Co(II), Ni(II), Mn(II), Zn(II), Ca(II), and Mg(II) with the biologically important secondary ligand zwitterionic buffers 3-(N-morpholino)propanesulfonic acid, 3-[(1,1-dimethyl-2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid, N-(2-hydroxyethyl)piperazine-N′-2-hydroxypropanesulfonic acid, piperazine-N,N′-bis(2-ethanesulfonic acid), and piperazine-N,N′-bis(2-hydroxypropanesulfonic acid) in a 1:1:1 ratio and the formation of various 1:1:1 normal and protonated mixed-ligand complex species was inferred from the potentiometric pH titration curves. The experimental conditions were selected such that self-association of the purine nucleotides and their complexes was negligibly small; i.e., the monomeric normal and protonated ternary complexes were studied. Initial estimates of the formation constants of the resulting species and the acid dissociation constants of adenosine 5′-mono-, 5′-di-, and 5′-triphosphate and the zwitterionic buffer secondary ligands have been refined with the SUPERQUAD computer program. In some M(II) mixed-ligand systems, the interligand interactions between the coordinate ligands, possibly H bond formation, have been found to be most effective in deciding the stability of the mixed-ligand complexes formed in solutions.

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Section: Resultsmentioning

confidence: 99%

“…6 torily on the basis of the monoprotonated ternary complexes which dissociate to give normal complexes.…”

Section: Resultsmentioning

confidence: 99%

Role of Biologically Important Zwitterionic Buffer Secondary Ligands on the Stability of the Mixed-Ligand Complexes of Divalent Metal Ions and Adenosine 5‘-Mono-, 5‘-Di-, and 5‘-Triphosphate

2001

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“…For the Ni-tartrate system, there is considerable disparity in the published stability constants: for an ionic strength of 0.1 mol dm À3 at 293-298 K, values for log K have been reported as 3.01 [39], 3.07 [40], 4.68 [41,42], and 5.42 [43]. In the presence of tartarate at 0.01 mol dm À3 KNO 3 , pH 5.5, the SSCP wave for Ni was shifted to more negative potentials.…”

Section: Ni-citrate and Ni-tartratementioning

confidence: 98%

Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 6: Features of irreversible complex systems

Town

Pinheiro²,

Domingos³

et al. 2005

Journal of Electroanalytical Chemistry

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“…[1][2][3][4][5] The synthesis of these complexes mainly involved the interaction of metal ion with amino acid L-histidine as a primary ligand while various diols acted as secondary ligands. Recently there has been considerable interest in the mixed chelation because it occurs commonly in biological fluids, which contain millions of potential ligands which are likely to compete for metal ions, found in vivo.…”

Section: Introductionmentioning

confidence: 99%

“…Recently there has been considerable interest in the mixed chelation because it occurs commonly in biological fluids, which contain millions of potential ligands which are likely to compete for metal ions, found in vivo. 2,4 It is well known that the ternary coordination complexes play an important role in biological processes like as an exemplified many instances in which enzymes are known to be activated by metal ions. 2 Ternary complexes have also been implicated in the storage and transport of active substances through membranes and thus phenomenon like these are to be strongly dependent on the formation of these species and the electronic configuration of metal ion concerned.…”

Section: Introductionmentioning

confidence: 99%

Solution Study of Ternary Complexes of Nickel(ii) Containing Histidine and Diols

Gesawat

Ahmed

Shakeel

2010

J. Chil. Chem. Soc.

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The stability constants of the mixed ligand ternary complexes of nickel(II) of the type MAB, MA 2 B and MAB 2 (where A = histidine, B = diols, viz. ethane diol, propane-1,2-diol, butan-1,3-diol, 2-butene-1,4-diol, pentane-2,4-diol and hexane-1,6-diol) were determined by potentiometric method. The difference in the stability constants of binary and ternary complexes (ΔlogK) and total enhancement of stability due to mixed ligand complex formation (log X) were of greater magnitude in MA 2 B systems than those in MAB 2 systems. This appeared to be due to the greater number of nitrogen atoms coordinating to metal ion in the MA 2 B species. Some changes in the stability constants have been found to be due to the variation in the size of the ring formed by diols. The stability of 2-Butene-1,4-diol containing species exhibited the highest stability in this series. It was concluded that the π-system of the ligands is important for such a great increase in stability.

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Ternary complexes of nickel(II) withAMP,ADP andATP as primary ligands and some biologically important polybasic oxygen acids as secondary ligands

Cited by 25 publications

References 30 publications

Role of Biologically Important Zwitterionic Buffer Secondary Ligands on the Stability of the Mixed-Ligand Complexes of Divalent Metal Ions and Adenosine 5‘-Mono-, 5‘-Di-, and 5‘-Triphosphate

Role of Biologically Important Zwitterionic Buffer Secondary Ligands on the Stability of the Mixed-Ligand Complexes of Divalent Metal Ions and Adenosine 5‘-Mono-, 5‘-Di-, and 5‘-Triphosphate

Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 6: Features of irreversible complex systems

Solution Study of Ternary Complexes of Nickel(ii) Containing Histidine and Diols

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