Complexation of dialkylaminomethylated calix[4]resorcinarenes with bis-acetonato and salicylaldiminato complexes of Cu(II)

Complexation of dialkylaminomethylated calix[4]resorcinarenes (H8X) with bi s-acetylacetonates and salicylaldiminates of Cu(II) was studied by UV-VIS a nd EPR spectroscopy methods, The complexation was found to proceed via tern ary complex formation and results in the octahedral or square-pyramidal str ucture with NR2 group coordination in equatorial or axial positions of Cu(I I) coordination sphere. The complexation of salicylaldiminates with N-Ar su bstituent is accompanied by the evaluation of salicylaldimines from the Cu( II) coordination sphere. This regularity is proposed to be determined by th e structure of the initial Cu(II) complex, being square planar for Cu(II) b is-acetylacetonate and salicylaldiminates with N-Alkyl substituent and tetr ahedrally distorted for salicylaldiminates with N-Ar substituent. (C) 2001 Elsevier Science B.V. All rights reserved.