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Nano Silica Phosphoric Acid: A Highly Efficient and Heterogeneous Catalyst for Synthesis of Azo Dyes Based on 1- and 2-Naphthol at Room Temperature

Abstract

Diazotization of aromatic amines with sodium nitrite, nano silica phosphoric acid (nano-SPA) at room temperature and diazo coupling with 1- or 2-naphthol has developed a mild and convenient method for the synthesis of azo dyes. The properties of SPA nano particles was characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction, and the structure of final azo compounds was verified by FT-IR and 1H NMR. The ensuing aryl diazonium salts supported on nano-SPA, were sufficiently stable to be kept at room temperature in the dry state.

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Acknowledgments

The authors are grateful to University of Kashan for supporting this work by Grant No. (159189/16).

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Correspondence to Abdolhamid Bamoniri.

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Bamoniri, A., Mirjalili, B.B.F., Fouladgar, S. et al. Nano Silica Phosphoric Acid: A Highly Efficient and Heterogeneous Catalyst for Synthesis of Azo Dyes Based on 1- and 2-Naphthol at Room Temperature. Natl. Acad. Sci. Lett. 39, 25–28 (2016). https://doi.org/10.1007/s40009-015-0411-3

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  • DOI: https://doi.org/10.1007/s40009-015-0411-3

Keywords

  • Nano silica phosphoric acid
  • Azo dyes
  • Diazotization
  • Heterogeneous catalyst
  • Solvent-free