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Synthesis and Properties of Polydentate Schiff Base Ligands having <TEX>$N_nO_2$</TEX> (n
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.5, pp.366-373
Kim,
S., Shin,
Y., &
Park,
S.
(1998). Synthesis and Properties of Polydentate Schiff Base Ligands having <TEX>$N_nO_2$</TEX> (n. Analytical Science and Technology, 11(5), 366-373.
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Abstract
Polydentate Schiff base ligands, BSDT(1,9-bis(2-hydroxyphenyl)-2,5,8-triaza-1,8-nonadiene) having <TEX>$N_3O_2$</TEX> atoms, BSTT(1,12-bis(2-hydroxyphenyl)-2,5,8,11-tetraaza-1,11-dodecadiene) having <TEX>$N_4O_2$</TEX> atoms, BSTP(1,15-bis(2-hydroxyphenyl)-2,5,8,11,14-pentaaza-1,14-pentadodecadiene) having <TEX>$N_5O_2$</TEX> atoms were synthesized. Protonation constants of these polydentate ligands were measured by potentiometry. Stability constants of the complexes between these ligands and the metal ions such as Cu(II), Ni(II) and Zn(II) were measured in DMSO by a polarographic method. It was observed that all metal(II) ions employed in this study formed 1:1 complexes with Schiff base ligands. Stability constants for the complex formation were in the order of Cu(II)>Ni(II)>Zn(II), and for the ligands were in the order of BSTP>BSTT>BSDT. There are due to the increase in the number of donor atoms. Both enthalpy and entropy changes were obtained in negative values. Exothermicity for the complex formation indicated tight binding between the ligands and metal ions. The negative entropy change would be related to the fact that solvent molecules are strongly interacting with the metal complexes.
- keywords
- schiff base ligand, protonation constant, stability constant
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