Thermodynamic Parameters of Complexation Calixpyrrole Derivative with Lanthanides Cations (Lu3, Ho3, Eu3+ and Pr3+) in Nonaquoeus Media
American Journal of Physical Chemistry
Volume 4, Issue 1, February 2015, Pages: 6-15
Received: Jan. 12, 2015;
Accepted: Jan. 23, 2015;
Published: Mar. 21, 2015
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Ahmed Yahya Issa Rubaye, Department of Chemistry, College of Science, University of Basrah, Basrah, Iraq
Calix  pyrrole derivative was used to target lanthanide cations. Meso tetramethyl-tetrakis-[(4-N, N-diethylacetamide) phenoxymethyl] calix  pyrrole, L2 was synthesised. This receptor constituted of hard donor atoms at the lower rim which interact with lanthanide cations being hard cations. 1H NMR investigations showed that both, the pyrrolic N and the acetamide arm group provide sites for interaction with lanthanide metal cations. These findings are verified by conductance measurements in acetonitrile, plots of molar conductance against the ligand/metal cation ratio reveal the formation of 1:2 complexes between this ligand with lanthanide metal cations. Standard thermodynamics parameters of complexation (log Ks, ΔHᵒc, ΔSᵒc, ΔGᵒc) of L2 with lanthanide cations in acetonitrile were determined using the Nano ITC (isothermal titration calorimetry). The complexation process between these metal cations and the receptor L2 was enthalpically controlled.
Ahmed Yahya Issa Rubaye,
Thermodynamic Parameters of Complexation Calixpyrrole Derivative with Lanthanides Cations (Lu3, Ho3, Eu3+ and Pr3+) in Nonaquoeus Media, American Journal of Physical Chemistry.
Vol. 4, No. 1,
2015, pp. 6-15.
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