Complex Formation of Dimethylaminomethylcalix [4] resorcinarene and 2-Dimethylaminomethylphenol with Cu(II) Salicylaldiminates

摘要

Electronic and ESR spectroscopy was used to show that the reactions of dimethylaminomethyl-calix [4] resorcinarene with Cu(II) salicyladiminates bearing alkyl substituents at the salicylaldiminate nitrogen atom give 1:1 adducts with the dimethylamino group coordinated axially to the Cu(II) complex. The spatially organized calix [4] resorcinarene structure and the possibility of outer-sphere interactions favor a much higher stability of the adduct compared with the similar complex with 2-dimethylaminomethylphenol. In going from alkyl to aryl substituents, salicylaldiminates are replaced by the anion derived from dimethylaminomethyl-calix [4] resocinarene. The same replacement takes place in the reaction with 2-dimethylaminomethylphenol.