Role of Mononuclear Rare Earth Metal Complexes in Promoting the Hydrolysis of 2-Hydroxypropyl p-Nitrophenyl Phosphate

✍ Scribed by Rui WANG; Hai LIN; Hua-Kuan LIN

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 114 KB
• Volume: 25
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.200790304

✦ Synopsis

Abstract

Two long‐chain multidentate ligands: 2,9‐di‐(n‐2′,5′,8′‐triazanonyl)‐1,10‐phenanthroline (L^1^) and 2,9‐di‐ (n‐4′,7′,10′‐triazaundecyl)‐1,10‐phenanthroline (L^2^) were synthesized. The hydrolytic kinetics of 2‐hydroxypropyl p‐nitrophenyl phosphate (HPNP) catalyzed by the complexes of L^1^ or L^2^ with La(III) or Gd(III) have been studied in aqueous solution at (298.2±0.1) K, I=0.10 mol·dm^−3^ KNO~3~ in pH 7.5–9.1, respectively, finding that the catalytic effect of GdL^1^ was the best among the four complexes for hydrolysis of HPNP. Its k~LnLH−1~, k~LnL~ and p__K__~a~ are 0.047 mol^−1^·L·s^−1^, 0.000074 mol^−1^·L·s^−1^ and 8.90, respectively. This paper expounded the studied result with the structure of the ligands and the properties of the metal ions, and deduced the catalysis mechanism.