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Abstract
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Carboxyl and nitrite functionalized graphene quantum dots was prepared from carboxyl and hydroxyl
functionalized graphene quantum dots using NaNO2 in the absence of mineral acids. This functional
group conversion was confirmed by FT-IR spectroscopy, photoluminescence and X-ray diffraction. The
carboxyl and nitrite functionalized graphene quantum dots was used as an effective nitrosonium ion
source and reusable catalyst for the efficient diazotization of a variety of arylamines without using any
additional acid. Subsequent azo-coupling of these freshly prepared diazonium salts with a range of active
aromatic compounds led to the requisite azo-dyes in excellent yields in very short reaction times with a
simple experimental procedure.
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