Article,
Synthesis of two new tripodal ligands and their cyclocondensation with 2-2-(2-formylphenoxy)ethoxybenzaldehyde in the presence of manganese(II) and cadmium(II) metal ions
POLYHEDRON, 27 (6): 1631-1638 (April 2008)
DOI: {10.1016/j.poly.2008.01.036}
Abstract
Two new asymmetric tripodal tetraamine ligands,
2-((bis(2-aminoethyl)amino)methyl)benzenamine (L(2)) and
2-(((2-aminoethyl)(3-aminopropyl)amino)metllyl)benzenamine (L(3)) 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 MnL(4)(MeOH)(ClO(4))(2) (1),
MnL(5)(MeOH) (ClO(4))(2) (2), CdL(4)(H(2)O(3))NO(3))(2) (3) and
CdL(5)(H(2)O)(NO(3))(2) (4) from the metal ion templated
cyclocondensation. reactions of
2-2-(2-formylphenoxy)ethoxybenzaldehyde with the (L(2)) or (L(3))
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 N(3)O(2) 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. (C) 2008 Elsevier Ltd. All
rights reserved.
