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Stability Constants for Transition Metal ions of Hexadentate <TEX>$N_6$</TEX> Ligands Containing Two Pyridyl Groups
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1999, v.12 no.5, pp.397-402
Kim,
S., Kim,
J., &
Park,
Y.
(1999). Stability Constants for Transition Metal ions of Hexadentate <TEX>$N_6$</TEX> Ligands Containing Two Pyridyl Groups. Analytical Science and Technology, 12(5), 397-402.
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Abstract
The open-chain hexadentate <TEX>$N_6$</TEX>, ligand containing two pyridyl groups, 1,15-bis(2-pyridyl)-2,6,10,14-tetraazapentadecane (bpyped) has been synthesized as its tetrahydroehloride salt and characterized by EA, IR, NMR, and Mass. Its proton dissociation constants(<TEX>$logK{^n}_H$</TEX>) and stability constants (<TEX>$log\;K_{ML}$</TEX>) for Co(II), Ni(II), Cu(II) and Zn(II) ions were determined at <TEX>$25^{\circ}C$</TEX> and ionic strength 0.10 M(<TEX>$KNO_3$</TEX>) in aqueous solution by potentiometry and compared with those or analogous <TEX>$N_6$</TEX> ligands contain one or two propylenic spacers, which make six-membered chelate rings, between the aliphatic nitrogen atoms.
- keywords
- stability, potentiometry, propylenlc spacers
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