Copper(II) Complexes of the Imidazolinone Herbicide Imazapyr

The copper(II) complexes formed by the imidazolinone herbicide imazapyr [(±)-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid] were studied in aqueous solution by potentiometric and spectroscopic techniques. Imazapyr acts as a chelating molecule and is effective over a wide pH range. T...

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Published inJournal of agricultural and food chemistry Vol. 44; no. 11; pp. 3698 - 3702
Main Authors Duda, Anna M, Dyba, Marcin, Kozlowski, Henryk, Micera, Giovanni, Pusino, Alba
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 1996
Subjects
accion de los plaguicidas
action des pesticides
analytical methods
Biological and medical sciences
cation
cationes
cations
chelateur
chelating agents
chemical composition
Chemical control
cobre
composicion quimica
composition chimique
copper
cuivre
espectrometria
espectroscopia esr
esr spectroscopy
Fundamental and applied biological sciences. Psychology
herbicidas
herbicide
herbicides
metal
metales
metals
Parasitic plants. Weeds
pesticide actions
Phytopathology. Animal pests. Plant and forest protection
potenciometria
potentiometrie
potentiometry
quelatos
spectrometrie
spectrometry
spectroscopie rse
technique analytique
tecnicas analiticas
titrimetria
titrimetrie
titrimetry
Weeds
Imidazole derivatives
Soils
Stability
Copper II Complexes
Chelation
Metal ion
pH
Environmental factor
Aqueous solution
Copper II Ions
Herbicide
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Summary:The copper(II) complexes formed by the imidazolinone herbicide imazapyr [(±)-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid] were studied in aqueous solution by potentiometric and spectroscopic techniques. Imazapyr acts as a chelating molecule and is effective over a wide pH range. The chelating set active in acidic media involves rather weak donors, namely the pyridine and imidazole nitrogens. In neutral media, the lactam site of the imidazolinone ring deprotonates and the ligand takes advantage of a rather basic nitrogen atom, which, assisted by the pyridine donor, yields stable complexes with five-coordination at the metal ion. Keywords: Imazapyr; 2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid; copper(II) complexes
Bibliography:H
H60
ark:/67375/TPS-2HL6ZQPN-M
Abstract published in Advance ACS Abstracts, October 1, 1996.
istex:E35288479BBD3CB67A2556E1696FFC02CA824D9A
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0021-8561
1520-5118
DOI:10.1021/jf9507856