Graphene Derivative As a Highly Efficient Nitrosonium Source: A Reusable Catalyst for Diazotization and Coupling Reaction

An efficient and a simple approach for the synthesis of azo dyes have been developed by the diazo coupling reactions of active aromatic compounds in the presence of in-situ nitrite functionalized graphene oxide polyvinyl alcohol GO-PVA composite as a highly efficient nitrosonium ion source. This methodology was objected to defeat the limitations of the earlier reported method such as use of acids, alkalis and toxic solvents, to reduce the stability of diazonium salts at room temperature, modest yields and long reaction time. Additionally, the attractive advantages of the process are that it incorporated mild conditions with excellent yield, simple product isolation process, fastest reaction time and recyclability of catalyst. The isolated products were characterized by FT-IR spectrum, UV-spectroscopy and 1H-NMR. The as-prepared composites were confirmed by UV-Visible, XRD, XPS, FT-IR spectrum, SEM and TGA analysis.