C-C absorption and C-C aromatic transition?

17 November 2020 0 7K Report

I have prepared graphene oxide. It shows two peaks one at 237nm and 2nd 300nm. First shows absorption peak and it is due to transition of bonding electron from highest occupied bonding moleculer orbit to a low occupied un bonding orbit but i can't understand 2nd peak? It is due to un-bonding electron but how electron is un-bond in carbon atom?

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