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Role of Mononuclear Rare Earth Metal Complexes in Promoting the Hydrolysis of 2‐Hydroxypropyl p ‐Nitrophenyl Phosphate
Author(s) -
WANG Rui,
LIN Hai,
LIN HuaKuan
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790304
Subject(s) - chemistry , hydrolysis , denticity , catalysis , aqueous solution , phosphate , medicinal chemistry , phenanthroline , kinetics , metal , metal ions in aqueous solution , rare earth , stereochemistry , polymer chemistry , nuclear chemistry , inorganic chemistry , organic chemistry , mineralogy , physics , quantum mechanics
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.