Potentiometric studies on complexes of Cr (Ⅲ) and Zr (IV) with some carboxylic acids
About this article
Abstract
The present work deals with the study of proton-ligand (pK) and metal-ligand (logK) of acetic acid, oxalic acid, and oxalacetic acid with Cr (Ⅲ) and Zr (IV) by potentiometric titration technique. The stoichiometries and stability constants of these complexes were evaluated using the Calvin-Bjerrum pH-titration technique as adopted by Irving and Rossotti.
Graphic and algebraic methods have been employed for determination of the stability constants in order to select the most accurate and sensitive method. Furthermore, the study aims to determine the factors affecting the precision of the methods under investigation and to compare complexes of these ligands with the first- and second-series transition elements of the d-block, with Cr and Zr taken as examples. The obtained results were in good agreement with each other.
Keywords
- Oxalacetic Acid
- Point-Wise
- Stability Constants
- Least Squares Method.
References
[1] Abdulbaset, A. Zaid, Mazahar. Farooqui, D.M. Janrao. (2012) Study of stability constant of biological active molecules (drug) using potentiometric titration technique. J. of chem. boil. phys. Sc. 2 (1). P. 67-81.
[2] A.K. Maldhure. S.S. Agarkar. R.K. Taywade. R.S. Wankhade. (2012) Metal-ligand stability constants of Co(â…¡), Ni(â…¡) and Cu(â…¡) metal ion complexes with N-(5-methyl-hydrox- yacetophenone)-N-(2-hydroxyacetophenone). J. Chem. Pharm. Res. 4 (8). P.3865-3868.
[3] Anil, B. Naik. Maroti, Narwade. (2008) Studies on influence of dielectric constants on complex equilibria between substituted pyrazalines and lanthanide metal ions pH-metrically. Amer.-Euras. scient. Res. 3(2). P. 212-216.
[4] Anjani, Kumar, Mishra. Prem, Mohan, Mishra. Sunil, K., Misra. (2011). Equilibrium studies on bivalent transition metal chelates with biologically active schiff’s base of heterocyclic aldehydes. Ras. J. Chem. 4(2). P. 303-319.
[5] Ashwini, kumar, Ashok. Kumar, Malik. (2007) Potentiometric studies on the complexes of Cu(â…¡), Cd(â…¡), Co(â…¡), Ni(â…¡), Pb(â…¡), and Zn(â…¡) with Gabapentin. Euras. Analy. Chem. 2(2). P. 1-6.
[6] Avinash, Ramteke. Marutil, Narwade. (2013) Studies of stability constants of complexes of chlorosubstitutedpyrazoles and pyrazoline with Cu(â…¡), Ni(â…¡), Co(â…¡) and Nd(â…¡) metal ions in 70% dioxane- water mixture at 0.1 ionic strength. Arch. of appl. Sc. 5 (1). P. 231-237.
[7] Cotton, Simon. (2006) Lanthanide and Actinide Chemistry. New York. John Wiley & Sons Ltd.http://dx.doi.org/10.1002/0470010088.
[8] F.R.,‘Hartley. C. Burgess, R.M. Alcock. (1980) Solution equilibria. New York. John Wiley & sons Ltd.
[9] F. J. C. Rossotti. H. S. Rossotti. (1955) Graphical methods for determining equilibrium constants.1- system of mononuclear complexes. Acta. chem. scand. Vol.9, 1166-1176. http://dx.doi.org/10.3891/acta.chem.scand.09-1166.
[10] Gurdeep, Raj. (1986) Advance inorganic chemistry-Ⅱ. [Online]. Ninth thoroughly revised 2004. Twelfth edition. SatyendraRastogi“Mitra†p.67. (E- Book). Available from: Book code: 277-12. [Accessed ed. 2010]
[11] Louis, Meites. (1981) an Introduction to Chemical Equilibrium and Kinetics. Pergamon series in analytical chemistry. Vol. 1. Hungary. Franklin printing house.
[12] Minaxi, Maru. M.K. Shah. (2011) Synthesis and physio-chemical studies of some divalent transition metal complexes of 2-(2’-chloro-6’-substituted quinoliny)-1H-benzo[d]imidazole ligands. J. Chem. Res. 2 (2). P. 14-27.
[13] Praveen P. Singh et al. J. Indian Soc. (2009) Determination of stability constants of metal-Methionine & and metal-methionine NTA complexes. Vol.86. P.83-86.
[14] Santosh, D. Deosarkar. Ashok, B. Kalambe. Vijay, J. Thakare. Shivraj, G. Wanale. Vinay, V. Hiwase. (2011) Potentiometric studies of electrolyte effects on complex equilibria of some substituted 5-(2-hydroxy phenyl) Pyrazoles. Der pharma chemic. 3 (6). P. 75-83.
[15] Sayyed, Hussain, Abdul Rahim, Mazahar, Farooqui. (2011) Studies of binary complexes of metal ions with mandelic acid by potentiometry. Chem. J. 02 (6). P. 206-209.
[16] Sumer, D. Thakur, Devidas, T. Mahajan. Kamlesh, P. Munot. Rajesh D. Deshmukh. Mangesh, S. Tihile. 2011b. Metal-ligand stability con-stants of Th (â…¢), Sm (â…¢), Nd (â…¢) and Pr (â…¢) metal ion complexes with two mercapto-4-substituted phenyl-6-substituted phenyl prymidines at 0.1M ionic strength pH-metrically. Der pharma chem. 3, (6), 382-389.
[17] Vogel, A.I. (1978) a text Book of Quantitative Inorganic Analysis. 4th edition. London: Longman.