Stability Constants for Transition Metal ions of Hexadentate $N_6$ Ligands Containing Two Pyridyl Groups

피리딘을 포함하는 여섯자리 $N_6$ 리간드와 전이금속 이온 착물의 안정도상수

  • Received : 1999.04.30
  • Published : 1999.10.25

Abstract

The open-chain hexadentate $N_6$, 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($logK{^n}_H$) and stability constants ($log\;K_{ML}$) for Co(II), Ni(II), Cu(II) and Zn(II) ions were determined at $25^{\circ}C$ and ionic strength 0.10 M($KNO_3$) in aqueous solution by potentiometry and compared with those or analogous $N_6$ 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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