Synthesis and magnetic properties of μ-phenolato copper (Ⅱ) binuclear complexes with different exogenous bridges

The syntheses and magnetic properties are reported for a series of copper(Ⅱ) complexes prepared from a pentadentate binucleating ligand 2,6-diformyl-4-methylphenol di(benzoyl-hydrazone) (H3L). These complexes incorporate different exogenous ions (X-) into a bridging position to form copper(Ⅱ) binuclear complexes of the formula Cu2(H2L)X]2+, where X-= Br-(1), Cl-(2), HO-(3), C2H5O-(4) and C3H3N2- (5). The complexes have been characterized with variable temperature magnetic susceptibility (4.2-300 K) and the observed data were fit to those from a modified Bleaney-Bowers equation by least-squares method, giving the exchange integral 2J = -6.2 cm-1 for 1, -76.4 cm-1 for 2, -241.9 cm-1 for 3, -231.1 cm-1 for 4 and -343.8 cm-1 for 5. This suggested that there is an antiferromagnetic interaction between the Cu(Ⅱ) ions and the sequence of the effect of some exogenous bridging ligands on magnetic coupling is corresponding to that in spectrochemical series.

Synthesis and magnetic properties of μ-phenolato copper (II) binuclear complexes with different exogenous bridges

The syntheses and magnetic properties are reported for a series of copper(II) complexes prepared from a pentadentate binucleating ligand 2,6-diformyl-4-methylphenol di(benzoylhydrazone) (H₃L). These complexes incorporate different exogenous ions (X^?) into a bridging position to form copper(II) binuclear complexes of the formula Cu₂(H₂L)X]²⁺, where X^? = Br^?(1), Cl^?(2), HO^?(3), C₂H₅O^?(4) and C₃H₃N^?₂(5). The complexes have been characterized with variable temperature magnetic susceptibility (4.2–300 K) and the observed data were fit to those from a modified Bleaney-Bowen equation by least-squares method, giving the exchange integral 2J = -6.2 cm^?1 for 1, -76.4 cm^?1 for 2, -241.9 cm^?1 for 3, -231.1 cm^?1 for 4 and -343.8 cm^?1 for 5. This suggested that there is an antiferromagnetic interaction between the Cu(II) ions and the sequence of the effect of some exogenous bridging Uganda on magnetic coupling is corresponding to that in spectrochemical series.