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The solid state behaviour of a short series of aromatic C-nitroso compounds bearing a range of ortho-substituents, including amides, alcohols, methyl and fluorine have been investigated using single crystal X-ray diffraction. Solid state analysis has confirmed the contrasting speciation behaviour of aromatic C-nitroso compounds incorporating strongly and weakly electron-donating groups at the ortho-position with the former group adopting monomers or oxo-oxime tautomers whilst the latter group adopts either the cis- or trans-azodioxy dimer depending on the nature of the solvent employed in the crystallisation conditions. The presence of weakly electron-withdrawing fluorine substituents on the nitrosoarene leads to the formation of the trans-azodioxy dimer. Single crystal X-ray diffraction analysis has identified the presence of a diverse array of hydrogen-bonding interactions and π–π stacking interactions that support the adoption of a range of supramolecular aggregates, including chains and tunnels, in the crystal packing of this small library of aromatic C-nitroso compounds.

ortho-Substituent effect on the crystal packing and solid state speciation of aromaticC-nitroso compounds