Citation: Guo Qiang SHANGGUAN, Jun ZHU, Ke Ying WANG, Arthur E. MARTELL. The Stability Constants of Complexes of BDBPH-Metals and Species Distributions[J]. Chinese Chemical Letters, ;2001, 12(10): 925-928. shu

The Stability Constants of Complexes of BDBPH-Metals and Species Distributions

1.
Department of Chemistry, Jining Medical College, Jining 272013;
2.
Department of Chemistry, Texas A & M University, College Station, Texas 77842

Received Date: 23 February 2001

Fund Project: The financial support from the Robert A. Welch Foundation (A-0259) in the U.S and China Scholarship Council (97837086) is gratefully acknowledged.

The stability constants of the mononuclear complexes of BDBPH-Zn(II), Cd(Ⅱ) and Mn (Ⅱ) were determined by the potentiometric equilibrium measurements, and species distributions were also discussed. The metal ions do not combine with the ligand until the first two protons of the ligand have almost been completely neutralized. The main species were mononuclear complexes with the diprotonated ligand, MH₂L. The three metal ions also form mono- and noprotonated (fully deprotonated) complexes, MHL, ML. The relative order of stabilities of the mononuclear complexes, ML, is Zn(Ⅱ) > Cd(Ⅱ) > Mn(Ⅱ). The ligand has strong tendency to form mononuclear complexes with Zn(Ⅱ), Cd(Ⅱ) and Mn(Ⅱ), and it can also form dinuclear complexes at high pH.
- BDBPH,
- stability constant,
- mononuclear complex,
- species distribution
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