Synthesis of two new tripodal ligands and their cyclocondensation with 2-[2-(2-formylphenoxy)ethoxy]benzaldehyde in the presence of manganese(II) and cadmium(II) metal ions |
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| Authors: | Hassan Keypour Reza Azadbakht Sadegh Salehzadeh Hamid Khanmohammadi Hamidreza Khavasi Harry Adams |
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| Affiliation: | 1. Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65174, Iran;2. Department of Chemistry, Arak University, Arak 38156, Iran;3. Department of Chemistry, Shahid Beheshti University, Evin, Tehran 1983963113, Iran;4. Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK |
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| Abstract: | Two new asymmetric tripodal tetraamine ligands, 2-((bis(2-aminoethyl)amino)methyl)benzenamine (L2) and 2-(((2-aminoethyl)(3-aminopropyl)amino)methyl)benzenamine (L3) were synthesized and characterized. [1+1] Macrocyclic Schiff-base complexes containing 1,2-diphenoxyethane head units and a 2-aminobenzyl pendant arm, were synthesized as [MnL4(MeOH)](ClO4)2 (1), [MnL5(MeOH)](ClO4)2 (2), [CdL4(H2O)](NO3)2 (3) and [CdL5(H2O)](NO3)2 (4) from the metal ion templated cyclocondensation reactions of 2-[2-(2-formylphenoxy)ethoxy]benzaldehyde with the (L2) or (L3) tripodal tetraamine ligands. The crystal structure determination of (1) and (4) showed that the complex cations that had formed consisted of pentagonal bipyramidally coordinated Mn(II) and Cd(II) ions, centrally located in a N3O2 macrocycle, with one 2-aminobenzyl pendant arm. Supporting ab initio HF-MO calculations have been undertaken using the standard 3-21G∗ and 6-31G∗ basis sets. |
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| Keywords: | Macrocyclic complexes Schiff-base Cadmium complex Manganese complex Pendant arm |
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