Effects of Ligand Chain Length and Terminal N-alkylation on the Protonation Constants and Stability Constants of Some Transition Metal Complexes of Linear Tetraaza and Pentaaza Ligands

C. Allen Chang, Fa Kun Shieh, Yuh Liang Liu, Chung Sun Chung

Research output: Contribution to journalArticlepeer-review

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Abstract

A number of terminal N-alkylated linear tetraaza and pentaaza ligands were prepared. Their ligand protonation constants and some transition and post-transition metal (Ni2+, Cu2+, Zn2+, and Cd2+) complex stability constants were determined by potentiometric titration methods. In general, methylation and ethylation at the terminal nitrogen atoms caused the corresponding ligand nitrogen basicity to increase; however, the corresponding metal complex stabilities were decreased compared to the non-alkylated structural analogs, presumably due to a steric effect.

Original languageEnglish
Pages (from-to)753-759
Number of pages7
JournalJournal of the Chinese Chemical Society
Volume45
Issue number6
DOIs
StatePublished - 1998

Keywords

  • Amine ligands
  • Pentaaza ligands
  • Potentiometnc titrations
  • Stability constants
  • Tetraaza ligands
  • Transition metal ions

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