Author(s): Ferreira, Rúben Rodrigues
Date: 2016
Persistent ID: http://hdl.handle.net/10362/20621
Origin: Repositório Institucional da UNL
Subject(s): Carbon quantum dots; Flavylium; EDC; Functionalization; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química
The goal of this master thesis was the functionalization of carbon quantum dots (CQDs) with flavylium salts. CQDs were synthesized through the hydro-thermal method using citric acid as a carbon precursor and ethylenediamine as a basic catalyst and passivation agent. Since these CQDs are known to bear pri-mary amines groups at their surface, flavylium derivatives with tails containing carboxyl groups were synthesized, 7-hydroxy-4’-methylcarboxyflavylium and 7-hydroxy-4’-methylcarboxy-4-phenylflavylium, in order to functionalize the CQDs with these kind of molecules, using EDC as coupling agent. CQDs were successfully functionalized with these two flavylium, however, the focus of this thesis was the study of CQDs functionalized with 7-hydroxy-4’-methylcarboxy-4-phenylflavylium, due to its simplest equilibrium between AH+ and A. CQDs were characterized by UV-Vis and steady-state fluorescence spec-troscopy.
