When a five-membered ring is introduced in a graphene sheet, a seven-membered ring is often included as an accompanying defect to ensure that the C-C bonds in the resulting model are reasonable. In this work, our goal is to elucidate the electronic structure influence of the specific incorporation of this defect as monitored by theoretical Mössbauer spectroscopy and electronic structure analyses. To this end, three models with pyrrolic N-donors embedded in graphene sheets were considered that differ in their degree of planarity, see Figure .