Abstract
Amino group terminated oligomeric aromatic polyamides were prepared using phosphorylation technique and subsequently converted into Schiff’s base coordination polymers by reaction with Co (II), Ni (II) and Cu (II) complexes of salicyladehyde [M(SAL)2] and 2-hydroxy-1-naphthaldehyde [M(NAPHTHAL)2]. These polyamide metal complexes were characterized by elemental analysis, IR spectroscopy and thermo gravimetric analysis; and an oxygen and nitrogen coordinated structure was inferred. Magnetic moment values of the different products indicated the variation in geometry. Introduction of metal ions into the polyamide chains enhanced the thermal stability of the coordination polymers as compared to the respective polymeric ligands. As an extension of this simple and easy technique, the thermal stability of fibers, films, sheets and blocks of amino group containing polyamides can be increasing by introduction of metal ions through Schiff base formation. These polyamide Schiff base complexes are expected to show promising antimicrobial activities.
Highlights
Design of the structural skeleton, chemical functionalization and adjustment of dimensions are attracting the attention of material scientists [1]
Coordination polymers are infinite systems build up with metal ions and organic ligands as the main elementary units that are linked via coordination bonds and other weak chemical interactions
The advantage of metal-ligand coordination is its high specificity and directionality and the strength of the metal coordination bond and the geometry of assembly vary by changing the metal ion [9]
Summary
Design of the structural skeleton, chemical functionalization and adjustment of dimensions are attracting the attention of material scientists [1]. Synthesis of aromatic polyamides is somewhat difficult due to slow reaction rates of aromatic amines They are being synthesized by low temperature condensation processes, which include interfacial and solution polymerization techniques. The oligomeric polyamides were linked through interaction with metal complexes of salicylaldehyde and 2hydroxy-1- naphthaldehyde to yield coordination polymers incorporating Schiff base structure. These polyamide Schiff base complexes are expected to show increased thermal stability and promising antimicrobial activities as observed with other polymeric Schiff base complexes [23,24]. Few polymeric complexes with Schiff base structures have been synthesized from aromatic amines and phenolic aldehydes These metal complexes have been widely studied because of their anticancer and herbicidal applications [28,29].
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