A research team at Nagoya University in Japan has developed a new technique for synthesizing nanographenes, remarkable materials with a vast number of potential structures that can even exhibit electric and magnetic characteristics beyond those of graphene.

Since each nanographene exhibits different physical characteristics, the key to applied nanographene study is to determine the relationship between the structure and characteristics of as many nanographenes as possible.

The researchers' task is thus to make a nanographene library, including data on the properties of as many nanographenes as possible. Yet, the present technique of nanographene synthesis, called a coupling reaction, is a multi-step process that generates an individual nanographene.

Therefore, for a 100-nanographene library to be created, the execution of 100 individual coupling reactions is essential. Even this would be a significant undertaking, making the construction of a truly extensive nanographene library virtually impossible.

To address this issue, the Nagoya University researchers, headed by Professor Kenichiro Itami, worked on the APEX reaction. It is a reaction that involves using polycyclic aromatic hydrocarbons as templates for producing nanographenes.



Polycyclic aromatic hydrocarbons include three regions of their structure — called the bay region, M region and K region — which can be elongated in an APEX reaction, thereby generating three nanographenes.

These nanographenes can then be elongated further in another reaction, implying that a huge number of nanographenes could be synthesized from a single polycyclic aromatic hydrocarbon template molecule.

Professor Itami’s team has already developed the K region APEX reaction and another group of researchers has done so for the bay region. So, the focus was on the M region.

The researchers activated the M region with the help of the 1950 Nobel Prize-winning Diels-Alder reaction and were successful in performing an elongation reaction on the activated M region. This enabled all three viable sites on the polycyclic aromatic hydrocarbons proficient to synthesize nanographenes.

The scientists could generate 13 nanographenes along with three APEX reactions, with a majority of them being new structures, thereby proving both the versatility and efficiency of this new technique.

This new study and its ability to expedite the making of nanographene libraries is a step towards the advent of the next generation of materials with the ability to revolutionize many applications areas.

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