Graphene aromatic system

The authors did not discuss these proposed proton and electron transfer reactions [60], but several of their features are noteworthy (i) quite appropriately, there is a distinction between phenolic or qui-none (>C) and carboxyl groups (-C), in the sense that carbon in the former is within the graphene s aromatic system (ii) the reasons for the absence of charge on the deprotonated carboxyl group (Reaction 5.9) and the presence of charge on the quinone group (Reaction 5.11) require justification and are presumably amenable to experimental verification. 

The extension of aromatic systems by annulation reactions is an effective way of extending smaller PAHs into larger graphene-like structures [83]. In this context multiple approaches have been devised. 

The interaction between the it-systems of the aromatic compound and the nanotube is based on an overlap of the respective orbitals. Bent graphene layers, as already stated in the chapter on fuUerenes, exhibit a curved it-system. On the one hand, this has an influence on the degree of electron delocaUzation, while on the other hand it sets a Umit to the overlap with planar aromatic compounds. Contrary to fuUerenes, however, the nanotubes are not curved in aU three directions in... 

The strategy of using functional pyrene derivatives is commonly employed when interfacing graphene with biological systems. However, besides pyrene [133,134], pentacene [135], dopamine [136], and some other aromatic derivatives were also used [137-139]. By functionalizing graphene with different chemical compounds, it can be endowed with the desired properties. 

---