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Graphene quantum dot (GQD)-organic hybrid compounds (GQD-2 b-e) were prepared by introducing 3,4,5-tri(hexadecyloxy)benzyl groups (C16) and linear chains terminated with a 2-ureido-4-[1H]-pyrimidinone (UPy) moiety onto the periphery of GQD-1. GQD-2 b-e formed supramolecular assemblies through hydrogen bonding between the UPy units. GPC analysis showed that GQDs with high loadings of the UPy group formed larger assemblies, and this trend was confirmed by DOSY and viscosity measurements. AFM images showed the polymeric network structures of GQD-2 e on mica with flat structures (ca. 1.1 nm in height), but no such structures were observed in GQD-2 a, which only carries the C16 group. GQD-2 c and GQD-2 d formed organogels in n-decanol, and the gelation properties can be altered by replacing the alkyl chains in the UPy group with ethylene glycol chains (GQD-3). GQD can thus be used as a platform for supramolecular polymers and organogelators by suitable chemical functionalization., (© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Graphene quantum dots (GQDs) have received considerable attention for their potential applications in the development of novel optoelectronic materials. In the generation of optoelectronic devices, the development of GQDs that are regulated in terms of their size and dimensions and are unoxidized at the sp(2) surfaces is desired. GQDs functionalized with bulky Fréchet's dendritic wedges at the GQD periphery were synthesized. The single-layered, size-regulated structures of the dendronized GQDs were revealed by atomic force microscopy. The edge-functionalization of the GQDs led to white-light emission, which is an uncommon feature., (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)