Complexes with macrocyclic ligands. V - Dinuclear copper(II) complexes with chiral macrocyclic ligands of Schiff-base type: Syntheses and structures

The synthesis and properties of four chiral, dinuclear, macrocyclic, cationic copper(II) complexes, [Cu-2(L-m,L-n)](2+) (1-4), are described. The two symmetrical compounds [Cu-2(L-2,L-2)][ClO4](2) (1 and 2) were synthesized in a one-step reaction from 2,6-diformyl-4-tert.-butylphenol, copper(II)-perchlorate and the chiral diamine (1S,2S)-1,2-diphenylethylenediamine (synthesis of 1) and (1R,2R)-1,2-diaminocyclohexane (synthesis of 2), respectively. For the synthesis of the two unsymmetrical compounds [Cu-2(L-Ph,L-n)]-ClO4](2) (3 and 4) the mononuclear, neutral copper(II) complex [CuLPh] (5) [synthesized from 2,6-diformyl-4-tert.-butyl-phenol, copper(II)-acetate and 1,2-phenylenediamine] was reacted with (1R,2R)-1,2-diaminocyclohexane (synthesis of 3) and (8)-1,1'-binaphthyl-2,2'-diamine (synthesis of 4), respectively. The structures of the two unsymmetrical copper(II) compounds (3 and 4) were determined by X-ray diffraction.