scholarly journals Exchange of Some Divalent Metal Cations and Their Effect on the Dissociation of Iron(III) Phosphate

1996 ◽  
Vol 13 (4) ◽  
pp. 241-260 ◽  
Author(s):  
S. Mustafa ◽  
A. Naeem ◽  
N. Rehana ◽  
T. Hussain
Keyword(s):  
Transition Metal ◽  
Thermodynamic Parameters ◽  
Alkaline Earth ◽  
Dissociation Constants ◽  
Ph Value ◽  
Transition Metal Ions ◽  
Divalent Metal ◽  
Solution Ph ◽  
Divalent Metal Cations ◽  
Titration Data

Potentiometric titrations of iron(III) phosphate have shown an apparently weak monobasic acid behaviour towards alkali, alkaline earth and divalent transition metal ions. The selectivity sequence and dissociation of the exchanger was found to increase in the order Cu2+ > Zn2+ > Ni2+ > Ca2+ > K+. The dissociation constants of iron(III) phosphate have been determined from Potentiometric titration data in the temperature range 303–323 K. In addition, the exchange of Cu2+, Zn2+ and Co2+ on iron(III) phosphate and the effect of these ions on dissociation were also studied as a function of concentration, temperature and solution pH value. The thermodynamic parameters ΔH0, ΔS0 and ΔG0 for the dissociation of iron(III) phosphate are also presented.

scholarly journals Synthesis and structural characterization of transition metal dithiolene derivatives containing divalent metals as counter-cations

CrystEngComm ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 1423-1432 ◽  
Author(s):  
Oscar Castillo ◽  
Esther Delgado ◽  
Diego Hernández ◽  
Elisa Hernández ◽  
Avelino Martín ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Transition Metal ◽  
Structural Characterization ◽  
Metal Cations ◽  
Magnetic Behaviour ◽  
Divalent Metal ◽  
Divalent Metals ◽  
Divalent Metal Cations ◽  
1D Coordination Polymer

Complexes containing [Fe2(SC6H2Cl2S)4]2− or [Ni(SC6H2Cl2S)2]− entities and divalent metal cations as well as an 1D-coordination polymer K/Zn have been obtained and their magnetic behaviour studied.

Endonuclease Active Site Plasticity Allows DNA Cleavage with Diverse Alkaline Earth and Transition Metal Ions

2011 ◽  
Vol 6 (9) ◽  
pp. 934-942 ◽  
Author(s):  
Kommireddy Vasu ◽  
Matheshwaran Saravanan ◽  
Valakunja Nagaraja
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Active Site ◽  
Dna Cleavage ◽  
Alkaline Earth ◽  
Transition Metal Ions

Chelating Tendencies of Some N-(2-Acetyl-1,3-Indandione) Trialkyl Ammonium Iodides with Transition Metal Ions

1973 ◽  
Vol 28 (5-6) ◽  
pp. 317-318 ◽  
Author(s):  
M. K. Bachlaus ◽  
K. L. Menaria ◽  
P. Nath
Keyword(s):  
Free Energy ◽  
Complex Formation ◽  
Transition Metal ◽  
Copper Complex ◽  
Dissociation Constants ◽  
Transition Metal Ions ◽  
Iron Complex ◽  
Potentiometric Studies ◽  
Kcal Mole ◽  
The Stability

The ligands T.P.A.I.* and T.B.A.I.** have been synthesised and their dissociation constants are 1.738 · 10-10 and 1.412 · 10-8 respectively. The potentiometric studies show that these reagents form 1 : 1 complex with copper(II) and iron(II). The stability constants of copper complex and iron complex with T.P.A.I. are 6.43 and 6.51 respectively and for T.B.A.I. 4.36 and 4.24 respectively. The free energy of complex formation at 25°C are 8.76 Kcal/mole and 8.87 Kcal/mole for Cu (II)-T.P.A.I. and Fe (II)-T.P.A.I. respectively, whereas the free energy of the Cu (II)-T.B.A.I. and Fe(II)-T.B.A.I. are 5.94 Kcal/mole and 5.78 Kcal/mole respectively.

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