Polymer complexes. LX. Supramolecular coordination and structures of N(4-(acrylamido)-2-hydroxybenzoic acid) polymer complexes

• Polymer complexes of N(4-(acrylamido)-2-hydroxybenzoic acid) (ABH) were synthesized and characterized.
• X-ray diffraction pattern show a mixture of polycrystalline and amorphous structure for polymer complexes.
• Molecular structures of ABH are optimized theoretically and quantum parameters are calculated.
• Thermodynamic parameters of the decomposition stages are evaluated and discussed.
• We found that the activation energy of PABH is greatly higher than its polymer complexes.

A number of novel polymer complexes of various anions of copper(II), cobalt(II), nickel(II) and uranyl(II) with N(4-(acrylamido)-2-hydroxy benzoic acid) (ABH) have been synthesized and characterized by elemental analysis, IR, 1H NMR, magnetic susceptibility measurements, electronic spin resonance, vibrational spectra and thermal analysis. The molecular structures of the ligand are optimized theoretically and the quantum chemical parameters are calculated. Tentative structures for the polymeric metal complexes due to their potential application are also suggested. The IR data exhibit the coordination of ONO2/OAc/SO4 with the metal ions in the polymeric metal complex. Vibrational spectra indicate coordination of carboxylate oxygen and phenolic OH of the ligand giving a MO4 square planar chromophore. Ligand field ESR spectra support square planar geometry around Cu(II). The thermal decomposition of the polymer complexes were discussed in relation to structure, and the thermodynamic parameters of the decomposition stages were evaluated applying Coast–Redfern and Horowitz–Metzger methods.

The XRD patterns of AB and ABH monomer powder forms.Figure optionsDownload as PowerPoint slide