A lanthanum macrocycle catalysed hydrolysis of a phosphate triester

Hay, Robert W.; Govan, Norman

doi:10.1039/c39900000714

Cited by 54 publications

(20 citation statements)

References 9 publications

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“…In recent years, the macrocyclic metal complexes, including a La(III) macrocyclic complex, as biomimetic models of hydrolytic metalloenzymes to catalyze hydrolysis of phosphate esters, have attracted considerable attention of chemists and biochemists. Our previous study showed that the complex made up of a heterocyclic nitrogen ligand and divalent metal Cu(II) or Ni(II) exhibited certain catalytic activity in the hydrolysis of phosphate ester in the water.…”

Section: Introductionmentioning

confidence: 99%

Construction and Activity of a New Catalytic System in the Hydrolysis of Bis(4‐nitrophenyl) Phosphate Ester

Xie

Wang

et al. 2013

Int J of Chemical Kinetics

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A new catalytic system containing an unsaturated heterocyclic nitrogen ligand and lanthanum(III) was constructed and used as a catalyst in the hydrolysis of bis(4‐nitrophenyl) phosphate ester (BNPP) in this work. The results indicated that this catalytic system showed greater catalytic activity in the hydrolysis of BNPP and better reproducibility and stability than other similar lanthanum(III) systems. The catalytic rate of the BNPP hydrolysis was about 107‐fold faster than that of its spontaneous hydrolysis at the same conditions. Compared with the previous Cu(II) or Ni(II) complex containing the same ligand in the water, the activity of the macrocyclic La(III) complex increases ca. 103‐fold for BNPP catalytic hydrolysis. The experimental data showed that the monohydroxy complex made of the heterocyclic nitrogen ligand and lanthanum(III) is the real active species as a catalyst in BNPP catalytic hydrolysis.

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Section: Introductionmentioning

confidence: 99%

Construction and Activity of a New Catalytic System in the Hydrolysis of Bis(4‐nitrophenyl) Phosphate Ester

Xie

Wang

et al. 2013

Int J of Chemical Kinetics

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“…Over the last two decades, a large number of metal complexes have been shown to possess the ability of hydrolysis of phosphonate mono-, di-, and trimester or phosphodiesters of DNA (Liu et al 2004;Hay and Govan 1990;Shiiba et al 1993;Jiang et al 2008). Most of these studies focused on the application of ligands containing ethylenediamine, macrocyclic ether, cyclen, etc.…”

Section: Introductionmentioning

confidence: 99%

Degradation of four organophosphorous pesticides catalyzed by chitosan-metal coordination complexes

Zhang

Meng

et al. 2015

Environ Sci Pollut Res

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Three types of chitosan with high (3.40 × 10(6)), medium (2.11 × 10(5)), and low (5.89 × 10(4)) molecular weights were chosen as ligands to synthesize chitosan magnesium, calcium, iron(III), and zinc coordination complexes. Degradation of four organophosphorous pesticides (dichlorvos, omethoate, dimethoate, and chlorpyrifos) by the above complexes in a heterogeneous system was studied using solid-phase extraction (SPE) and gas chromatography (GC). The degradation effect is related to the different types of chitosan, metal, and organophosphorus pesticides (OPs). Complexes of transition metals and the low molecular weight chitosan showed high hydrolytic activity. The chitosan-iron(III) complex was further used to study its catalytic kinetics on the hydrolysis of OPs. At pH 7.0 and 20 °C, the half-life of dichlorvos hydrolyzed by chitosan iron(III) was 52 h, whereas that of spontaneous dichlorvos hydrolysis was 105 h. The degradation ratio of omethoate and dimethoate increased to 38 and 52 %, respectively, which were 34 and 48 % higher than the control after 6 days at pH 7.0 and 20 °C. For all tested conditions, an increase of pH and temperature resulted in a higher degradation rate.

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“…Hay and Govan [20] reported the activity of a La(III) macrocyclic complex in the hydrolysis of 2,4-dinitrophenyl diethyl phosphate in the pH range 7.0 -9.5. Our previous study [21] also found that complexes made up of a nitrogen heterocyclic ligand and divalent metal Cu(II) or Ni(II) displayed high catalytic activity in the hydrolysis of phosphate ester in water.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Mechanism and Activity of a Nitrogen Heterocycle Lanthanum(III) Complex in the Hydrolysis of bis(4-nitrophenyl) Phosphate Ester

Cai

Fěng

Zou

et al. 2012

Progress in Reaction Kinetics and Mechanism

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The system made up of a nitrogen heterocycle ligand and lanthanum(III) ion was used in the catalytic hydrolysis of bis(4-nitrophenyl) phosphate ester (BNPP). This catalytic system showed higher catalytic activity in this hydrolysis and better reproducibility and stability than other similar lanthanum(III) ion systems. The rate of the catalytic hydrolysis was about 10 8 -fold faster than that of its spontaneous hydrolysis under the same conditions. Compared with previous Cu(II) or Ni(II) complexes containing the same ligand in water, the activity of the macrocyclic La(III) complexe is increased ca 10 4 -fold. The experimental evidence showed that the mon-hydroxy complex made of the nitrogen heterocycle ligand and lanthanum(III) ion is the active species as catalyst in the catalytic hydrolysis of BNPP.

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A lanthanum macrocycle catalysed hydrolysis of a phosphate triester

Cited by 54 publications

References 9 publications

Construction and Activity of a New Catalytic System in the Hydrolysis of Bis(4‐nitrophenyl) Phosphate Ester

Construction and Activity of a New Catalytic System in the Hydrolysis of Bis(4‐nitrophenyl) Phosphate Ester

Degradation of four organophosphorous pesticides catalyzed by chitosan-metal coordination complexes

Catalytic Mechanism and Activity of a Nitrogen Heterocycle Lanthanum(III) Complex in the Hydrolysis of bis(4-nitrophenyl) Phosphate Ester

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