Polymer complexes. LVI. Supramolecular architectures consolidated by hydrogen bonding and π–π interaction

The amidation of aliphatic amine with acryloyl chloride in dry benzene as a solvent has been performed. Moreover, the polymer complexes have been prepared and structurally characterized by analyses, molar conductance measurements, magnetic susceptibility measurements, spectral techniques like IR, UV, NMR, ESR and thermal methods. Acryloyl hydrazine (AH) has been shown to behave as a bidentate ligand via its nitrogen (NH2 of hydrazine group) and C–O/CO (acryloyl group) in polymer complexes, all of which exhibit supramolecular architectures assembled through weak interaction including hydrogen bonding and π–π stacking .The magnetic and spectral data indicate a square planar geometry for Cu2+ complexes and an octahedral geometry for Co(II) and UO2(II). The ESR spectral data of the Cu(II) complexes showed that the metal–ligand bonds have considerable covalent character. The thermal stability was investigated using thermogravimetric analysis. The results showed that the polymer complexes are more stable than the homopolymer.

The effective activation energies for the thermal degradation of PAH and AH–metal salt polymer complexes were determined from the temperature dependence of the chain rupture rate. The rate constant of the thermal degradation was plotted according to Arrhenius relationship.Figure optionsDownload as PowerPoint slideHighlights
► The amidation of aliphatic amine with acryloyl chloride in dry benzene as a solvent has been performed. Moreover, the polymer complexes have been prepared.
► The thermal stability was investigated using thermogravimetric analysis.
► The ESR spectral data of the Cu(II) complexes showed that the metal–ligand bonds have considerable covalent character.
► The present report, together with our previous work, indicates that the structure of polymer complexes of AH can be turned by variation of the inorganic co-ligands.