Heterocyclic aromatic compounds containing nitrogen, like thiazoles, is known to decrease the rate of copper corrosion.  N or S donor atoms within those compounds are responsible for attachment of the inhibitor molecules to the metal surface. We synthesized coordination networks using pyrazole-4-sulfonate (L1�) and 3,5-dimethylpyrazole-4-sulfonate anions (L2�) and various metals, and characterized the complexes by infrared spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction. The varying size and charge of the cations in these complexes produce alternating inorganic-organic layered materials.  We found a correlation between the size and charge of the cations, the coordination mode of the ligand and the hydration of the metal ion.  Copper corrosion studies with complexes of L1� as inhibitors, conducted at different pH values, show that corrosion protection is obtained with all compounds at pH 4 and 3. Thin films formed by these complexes on copper metal surfaces were studied by optical microscope, scanning electron microscopy and energy dispersive X-ray spectroscopy.

Layered inorganic-organic networks of pyrazole-4-sulfonate metal complexes and their use in copper anticorrosion protective films

243rd National Meeting (2012)

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