Elucidating the chemical structure of pyrogenic organic matter by combining magnetic resonance, mid-infrared spectroscopy and mass spectrometry

► High-field solid state NMR probed structure in dual-enriched (13C/15N) pine wood PyOM. ► 13C NMR, DRIFT and 18O analyses confirmed the development of PyOM aromatic moieties. ► EPR revealed unpaired electron content in the PyOM. ► 15N NMR corroborated formation of new nitrogenous aromatics upon pyrolysis.