Structurally diverse copper(II) herbicide complexes: mono- and bi-nuclear neutral or cationic complexes
Abstract
Copper complexes with the commerical auxin herbicides 2,3-dichlorophenoxyacetic acid and 2-(2,4-dichlorophenoxy)propanoic acid and 2,2′-bipyridine(bipy) were prepared and characterized: [Cu2(Cl2C6H3OCH2CO2)4(MeOH)2]1, [Cu{Cl2C6H3OCH(Me)CO2}2(bipy)(H2O)]2 and [Cu{Cl2C6H3OCH(Me)CO2}(bipy)2]Cl 3. The available evidence supports a dimeric structure for complexes 1 while the presence of bipy leads to monomeric forms. In dimethylformamide solution the binuclear complex is converted into a monomeric complexe upon addition of a > 1:2 ratio of bipy. The ESR powder spectrum of compound 2 exhibits features characteristic of the presence of a S= 1 triplet state which may be assigned to a hydrogen-bond network. The crystal structures of the three complexes have been determined.
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