Synthesis and spectroscopic characterization of a new macrocyclic Schiff base formed by the reaction of 1,5- bis (2-formylphenyl)pentane and 2,6-diaminopyridine, and a study of its metal complexes

Polyether complexes of groups 13 and 14

Notable aspects of the chemistry of polyether complexes of group 13 and 14 elements are reviewed.

Synthesis of Complexes of Pb(II), Cd(II), Zn(II), Ni(II), La(III) and Cu(II) with a Schiff Base Macrocyclic Ligand Containing Pyridine

1,5-bis(2-formylphenyl)pentane (synthesised from 1,5 dibromopentane and salicylaldehyde). reacts with 2,6-diaminopyridine to give a new macrocyclic ligand that gives Cu(II), Ni(II), Pb(II), Zn(II), Cd(II) and La(III) complexes by reaction with Cu(NO3)2·3H2O, Ni(NO3)2·6H2O, Pb(NO3)2, Zn(NO3)2·6H2O, Cd(NO3)2·4H2O and La(NO3)3·6H2O respectively. The ligand and its metal complexes have been characterised by elemental analysis, IR, 1H and 13C NMR, UV-Vis spectra, magnetic susceptibility, conductivity measurements and mass spectra. All complexes are diamagnetic and the Cu(II) complex is binuclear.

Synthesis and Spectral Studies of Macrocyclic Pb(II), Zn(II) and La(III) Complexes by Template Reaction of 1,4-Bis(3-Aminopropoxy)Butane with Metal Nitrate and Salicylaldehyde Derivatives

Six new macrocyclic complexes are synthesised by template reaction of 1,4-bis(3-aminopropoxy)butane with metal nitrate and 1,7-bis(2-formylphenyl)-1,4,7-trioxaheptane or 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane and their structures are proposed on the basis of elemental analysis, FTIR, UV-Vis, molar conductivity measurements, 1H NMR and mass spectra. The complexes are 1:2 electrolytes for Pb(II),Zn(II) complexes and 1:3 electrolytes for La(III) as shown by their molar conductivities (Λm) in DMSO at 10−3 mol L−1. The configurations of La(III) and Zn(II) complexes are proposed to probably octahedral.