First Example of Schiff Bases Containing Poly(Acryl Amid) in the Synthesis and Characterization

A novel polymeric‐Schiff base derived from the condensation reaction poly(acryl amid) and indole‐3‐carboxaldehyde has been synthesized and their Co(II) and Ni(II) complexes have been prepared. Mol ratio of acrylamid group and Schiff bases group was estimated by means of height of ‐CH multiple peaks and –CH=N‐ peak in ¹H‐NMR spectrum. The studied substances were characterized by molar conductance, magnetic susceptibility, electronic and IR spectral studies. In addition, main units have been suggested with elemental analysis for these substances, and than the weight average molecular weight (M_w) has been suggested. The number average molecular weight (M_n) was determined with a vapor pressure osmometer. Polydispersity index (PDI) found to be ca 1.7 from M_w/M_n for poly‐Schiff bases and their Co(II) and Ni(II) complexes. PAA‐Schiff bases were found to have the highest thermal stablility compared to that of the Co(II) and Ni(II) complexes. The conductivities of the PAA‐Schiff bases and their complexes were measured by the four‐probe technique and were found in the range 10⁻⁵−10⁻⁶ S cm⁻¹.

Keywords:

• poly‐Schiff bases
• poly condensation
• thermal stability
• polymeric‐complexes
• poly(acryl amid)
• conductivity

Acknowledgements

The authors thank the Gazi Üniversity Research Fund (Project number: 05/2005–44) for financial support.