Taqui Khan, M. M. ; Rabindra Reddy, P. (1973) Thermodynamic quantities associated with the interaction of guanosine triphosphate and inosine triphosphate with bivalent metal ions Journal of Inorganic and Nuclear Chemistry, 35 (8). pp. 2813-2819. ISSN 0022-1902
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0022-1902(73)80513-5
Abstract
Potentiometric equilibrium measurements have been made at 25, 35 and 45° for the combination of tetranegative anions of GTP and ITP with 7 bivalent metal ions in a 1:1 ratio of ligand to metal ion. At all the temperatures studied, the constants decrease in the order Cu(II) > Ni(II) > Zn(II) > Co(II) > Mn(II) > Mg(II) > Ca(II) for GTP chelates and for the ITP chelates in the order Cu(II) > Ni(II) > Co(II) > Zn(II) > Mn(II) > Mg(II) > Ca(II). The enthalpy and entropy changes for the formation of normal chelates of GTP and ITP are calculated from temperature coefficient data. The relatively small values of ΔHf° coupled with a large positive values of ΔSf° offers an evidence for the role of entropy as the primary factor favouring the formation of the normal 1:1 metal chelate species of GTP and ITP in solution.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 58487 |
| Deposited On: | 31 Aug 2011 12:13 |
| Last Modified: | 31 Aug 2011 12:13 |
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