Synthesis and characterization of Mg~(II), Ca~(II), Sr~(II) and Ba~(II) complexes of 2,15-dimethyl-3,16-diethyl/propyl/phenyl-1,4,14,17-tetraazacyclohexacosa- 1,3,14,16-tetraene

摘要

2+2 Cyclocondensation reactions of 1,9-diaminononane with a-diketones viz. 2,3-pentanedione, 2,3-hexanedione or l-phenyl-1,2-propanedione in the presence of metal ions as templates have afforded hexacoordinated complexes of the general formula [MLX2] (where M = Mg, Ca, Sr or Ba; L = N4 macrocycle having 26-membered ring and X = Cl or NCS). The resulting macrocyclic complexes have been characterized by elemental analyses, conductance measurements and IR and ~1H NMR spectra.