Synthesis,Characterization, and an ab initio Study of a Manganese(II) Macrocyclic Schiff-Base Complex with Two 2-Aminoethyl Pendant Arms |
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Authors: | Keypour Hassan Khanmohammadi Hamid Wainwright Kevin P. Jameh-Bozorgi Saeed |
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Affiliation: | (1) Department of Chemistry, Bu-Ali Sina University, Hamadan, Iran;(2) School of Chemistry Physics and Earth Sciences, The Flinders University of SA, GPO Box 2100, Adelaide, SA, 5001, Australia;(3) Department of Chemistry, Faculty of Science, Arak branch, Islamic Azad University, Arak, Iran |
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Abstract: | The cyclocondensation of 2,6-diformylpyridine with N,N,N,N-tetrakis(2-aminoethyl)ethane-1,2-diamine (pentene) in the presence of MnII forms the [1 + 1] pendant arm Schiff-base macrocyclic complex, [MnL3]2+. The ligand is a 15-membered pentaaza macrocycle having two 2-aminoethyl pendant arms {L3= 6,9-bis(aminoethyl)-3,6,9,12,18-pentaazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentene}. The complex, investigated by analytical, spectroscopic and magnetic techniques, supports the formation of a highly symmetrical pentagonal bipyramid complex with the MnII ion located within a pentaaza macrocycle and two pendant amines coordinating on opposite sides of a plane defined by the macrocycle and the metal ion. The structure of the complex was also verified by ab initio HF-MO calculations using a standard 3-21G basis set. |
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