Abstract
We report the experimental realization of eta(6)-complexes of group 6 transition metals with a single layer graphene using photo-activated reactions with organometallic compounds. The reaction progress was followed by in-situ measurements of the graphene conductivity. We observed that the chromium reagents exert the strongest effect on the electronic properties of graphene, leading to (eta(6)-graphene) CrL [L = C6H6, (CO)(3)] complexes with enhanced conductivity. Thus, in the case of covalent functionalization of graphene with Cr(CO)(6), the conductivity increased by a factor of 4, while the (eta(6)-C6H6) Cr(CO) 3 reagent doubled the conductivity producing the least enhancement. This mode of covalent bonding preserves the conjugation and the planarity of the graphene structure and offers a promising route for the preparation of a new class of graphitic materials functionalized with transition metals, which may find applications in optoelectronics, spintronics and magnetic nanodevices. (C) 2017 Elsevier Ltd. All rights reserved.