Synthesis and properties of transition-metal complexes of 5,5-bis(N-8-quinolylcarbamoyl)nonane

Abstract

Several metal complexes of 5,5-bis(N-8-quinolylcarbamoyl)nonane (H₂L¹) and the copper(II) complex of 5,5-bis(N-2-methyl-8-quinolylcarbamoyl)nonane (H₂L²) have been synthesised and their spectroscopic properties studied. Whereas complexes of Cu, Ni, Pd, Zn and Cd with H₂L¹ were obtained, no complex with Co and Pt could be isolated. On the other hand, the copper complex of H₂L² was readily obtained, but the nickel complex could not be isolated. These compounds can be formulated as [ML] in which the amide groups of H₂L¹ and H₂L² are fully deprotonated. They were characterized by mass, IR and ¹H NMR spectroscopy. Their ultraviolet–visible, luminescence and redox properties were also investigated.