TEMPLATE SYNTHESES AND PROPERTIES OF COPPER(II)-LANTHANIDE(III) COMPLEXES OF PHENOL-BASED SYMMETRIC AND UNSYMMETRIC DINUCLEATING MACROCYCLES

Abstract

Cu(II)-Ln(III) complexes of H₂(fsal-n,m) ((n,m = (2,3), (3,2) (3,3); Ln = Lanthanide), fsal-n,m-Cu.Ln, have been synthesized by a template reaction, where fsal-n,m ^2- denotes inculcating macrocycles with two 2,6-bis(iminomethyl)-4-methylphenolate entities combined through two lateral chains, -(CH₂)_n- and -(CH₂)_m-, at the iminonitrogens. Temperature dependences of magnetic susceptibilities for the Cu(II)-Gd(III) complexes showed that an intermolecular ferromagnetic interaction operates between Cu(II) and Gd(III) ions in fsal-2,3-Cu,Gd and fsal-3,2-Cu,Gd. Absorption spectra suggested that substrates possessing N- and O-donor groups such alcohols are specifically bound at the Cu-Ln center of fsal-2,3-Cu,Ln. through the nitrogen to the copper site and through the oxygen to the lanthanide site. The fluorescence intensity of Eu(III) decreased drastically on forming the Cu-Eu complex.

Key Words:

• Heteronuclear complex
• lanthanide complex
• inculcating legend
• Schiff base