Solution state studies on thermodynamic parameters and complexation behavior of inner transition metal ions with creatinine in aqueous and mixed equilibria

Journal of the Iranian Chemical Research

مقاله 6، دوره 2، شماره 4، اسفند 2009، صفحه 267-275   

نویسندگان

Sangita Sharma^* ؛ Ashish Patel؛ Jasmin Bhalodia؛ Jayesh Ramani

Department of Chemistry, Hemchandracharya, North Gujarat University, Patan-384 265, Gujarat, India

چکیده

The determination of formation constants of binary inner transition metal complexes where M
=Y(III) or La(III) or Ce(III) or Pr(III) or Nd(III) or Sm (III) or Gd (III) or Dy (III) or Th(IV) and
L = Creatinine have been carried out using Irving–Rossotti titration technique in aqueous media
at different temperatures and at ionic strength. To understand more about the nature of
equilibrium involving inner transition metals with Creatinine, the effect of dielectric constants on
the stability of these complexes at different percentage of solvent variation and at different
solvent systems has been studied. The formation constant (logβn) have been calculated on IBM
computer using BEST Program. Thermodynamic parameters (ΔG, ΔH and ΔS) are also
evaluated, negative ΔG, ΔH and ΔS values indicate that complex formation is favorable at
ordinary temperatures. Species distribution curves of complexes have been plotted as function of
pH using Fortran IV program SPE PLOT to visualize the equilibria systems in pH range of 2-8
pH. The order of stability for metals is Y < La < Ce < Pr < Nd < Sm < Gd < Dy < Th. This order
can be explained on the basis of basicity of ligand, protonation of ligand, electronic
configuration of metal ions, size and ionic potential of tripositive ion, charge/size ratio of metal
ions and species distribution diagrams.

کلیدواژه‌ها

Binary complexes؛ Formation constant؛ Creatinine؛ Ionic strength

مراجع

[1] E. Bamann, H. Trapmann, F. Fischler, J. Biochem. 328 (1954) 89-96.
[2] J.M. Bowen, Can. J. Physiol. Pharmacol. 50 (1972) 603-611.
[3] G.R. Choppin, A.J. Graffeo, J. Inorg. Chem. 4 (1965) 1254-1257.
[4] K.J. Ellis, J.F. Morrison, Anal. Biochem. 68 (1975) 429-435.
[5] C.H. Evans, Biochem. J.195 (1981) 677-684.
[6] G.M. Kanapilly, Health Phys. 39 (1980) 505-519.
[7] M.D. Lind, B. Lee, J.L. Hoard, J. Am. Chem. Soc. 87 (1965) 1611-1612.
[8] A.A. El-Sherif, J. Solution Chem. 35 (2006) 1287-1301.
[9] H.G. Brittain, F.S. Richardson, Bioinorg. Chem. 7 (1977) 233-243.
[10] W.D. Horrocks, A.P. Snyder, Biochem. Biophys. Res. Commun. 100 (1981) 111-117.
[11] L.I. Katzin, Inorg. Chem. 8 (1969) 1649-1654.
[12] H. Hohmann, B. Hellquist, R. Van Eldik, Inorg. Chim. Acta. 188 (1991) 25-32.
[13] D.S. Pabreja, R.A. Patel, S. Sharma, J.J. Vora, J.D. Joshi, Asian J. Chem. 13 (2001) 357-359.
[14] M.P. Brahmbhatt, S. Sharma, J.J. Vora, J.D. Joshi, Ultra Science. 14 (2002) 262-265.
[15] A. De Robertis, C. De Stefano, C. Rigano, S. Sammartano, J. Solution Chem. 19 (1990) 569-587.
[16] C. Rey-Castro, R. Castro-Varela, R. Herrero, M.E. Sastre de Vicente, Talanta 60 (2003) 93-101.
[17] J.L. Gross, de M.J. Azevedo, S.P. Silveiro, L.H. Canani, M.L. Caramori, T. Zelmanovitz, Diabetes
Care. 28 (2005) 164-176.
[18] Science, High Wire Press, Published by American Association for the Advancement of Science, New
York, 1984.
[19] E. Nieboer, The lanthanide ions as probes in biological system, Structure and Bonding, 1975.
[20] C.H. Evans, Biochemistry of the Lanthanides, Plenum Press, London, 1990.
[21] H.M. Irving, H.S. Rossotti, J. Chem. Soc. 17 (1954) 2904-2910.
[22] J.M. Ramunas, A.E. Martell, Can. J. Chem. 60 (1982) 168-173.
[23] R.J. Motekaitis A.E. Martell, Can. J. Chem. 60 (1982) 2403-2409.
[24] M.J.D. Powell, Comput. J. 7 (1964) 155-162.
[25] R. Fletcher, M.J.D. Powell, Comput. J. 6 (1963) 163-168.
[26] A.E. Martell, R.J. Motekaitis, Determination and use of stability constants, VCH Publishers, New
York, 1992.
[27] S. Glasstone, An Introduction to Electrochemistry, Affiliated East-West press pvt Ltd., 1942.
[28] K.S. Pitzer, J. Phys. Chem. 77 (1973) 268-277.
[29] K.S. Pitzer, Activity Coefficients in Electrolyte Solution, Vol. II CRC Press, Boca Raton, Florida,
1991.