NDLI: PNPP Hydrolysis Catalyzed by Manganese(III) Complexes with Crowned Salicylaldimine Schiff Base Ligand

Content Provider	Springer Nature Link
Author	Li, Jian zhang Xu, Bin Li, Shen Xin Zeng, Wei Qin, Sheng ying
Copyright Year	2005
Abstract	Four manganese(III) complexes (MnL$^{1}$Cl, MnL$^{2}$Cl, MnL$^{4}$$_{2}$Cl, MnL$^{5}$$_{2}$Cl) with a crowned salicylaldimine Schiff base ligand have been synthesized and employed as models to mimic hydrolase in the hydrolysis of p-nitrophenyl picolinate (PNPP). The kinetics and mechanism of catalytic PNPP hydrolysis have been investigated. The kinetic mathematical model of PNPP cleavage catalyzed by these complexes has been proposed. The effects of the ligand structure and crown ether ring in complexes, and the reactive temperature on the rate of catalytic PNPP hydrolysis have been also examined. The results show that compared with the crown-free analogous MnL$^{3}$Cl and MnL$^{6}$$_{2}$Cl, the crowned Schiff base manganese(III) complexes, MnL$^{1}$Cl, MnL$^{2}$Cl, MnL$^{4}$$_{2}$Cl and MnL$^{5}$$_{2}$Cl, exhibit more high catalytic activity, which follow the order: MnL$^{1}$Cl >MnL$^{2}$Cl >MnL$^{4}$$_{2}$Cl >MnL$^{5}$$_{2}$Cl >MnL$^{3}$Cl >MnL$^{6}$$_{2}$Cl; the pseudo-first-order-rate (k$_{obs}$) for the PNPP hydrolysis catalyzed by the complex MnL$^{1}$Cl containing three crown ether rings is highest among six complexes and is 1.81 times that of MnL$^{3}$Cl, 1.49 × 10$^{3}$ times that of spontaneous hydrolysis of PNPP, respectively, at pH = 7.00, [S] = 2.0 × 10$^{−4}$ mol dm$^{−3}$.
Starting Page	669
Ending Page	676
Page Count	8
File Format	PDF
ISSN	03404285
Journal	Transition Metal Chemistry
Volume Number	30
Issue Number	6
e-ISSN	1572901X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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