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Synthesis and Characterization of Cd(II) Macrocyclic Schiff Base Complex with Two 2-Aminoethyl Pendant Arms

H. Keypour^a,*, A.A. Dehghani-Firouzabadi^a, M. Rezaeivala^b and H. Goudarziafshar^c

^aFaculty of Chemistry, Bu-Ali Sina University, Hamedan 65174, Iran
^bDepartment of Chemical Engineering, Hamedan University of  Technology, Hamedan, 65155, Iran
^cDepartment of Chemistry, Faculty of Science, Ilam University, P.O. Box 69315516, Ilam, Iran  

A new pendant armed Schiff base macrocyclic complex of [CdL]²⁺, was prepared via cyclocondensation of 2,6-bis(2-formylphenoxymethyl)pyridine with branched hexaamine in the presence of Cd(II) ion. The ligand was 23-membered oxaazamacrocycle having two 2-aminoethyl pendant arms [L: 3,28-dioxa-14,17-bis(aminoethyl)-11,14,17,20,34-pentaazatetracyclo[34.3.1] tetratriacontane-1(34), 4, 6, 8, 10, 20, 22, 24, 26, 30, 32-undecaene]. The complex was investigated by IR, ¹H NMR, microanalysis and MALDI mass spectroscopy. The structure of the complex was verified by ab initio HF-MO calculations using a standard 3-21G* basis set. This article introduces an unusual seven-membered chelate ring and shows that by its using, the Cd-N bonds lengths within the macrocycle would be longer and also Cd(II)-pendant amine bonds lengths would be shorter.

Keywords: Macrocyclic complex, Schiff base, Cadmium(II),  Pendant arm, Ab initio