Identification of ONO⋯ONO interactions among inorganic coordination complex molecules in the crystal lattice of a chiral Mn(IV) compound

The chiral Schiff base ligand H2L on reaction with Mn(CH3COO)2 · 4H2O in methanol gave a yellow precipitate, which on recrystallization from dimethylformamide (DMF) solvent solvent gave dark-brown needle shaped crystals of a chiral Mn(IV) compound [MnL2] · DMF (1). Crystal structure analysis of compound 1 revealed an interesting O⋯O non-covalent interaction between –NO2 groups present on adjacent [MnIVL2] complex units which leads to the formation of chainlike arrangement in the crystal lattice of the relevant complex.

Graphical abstractThe chiral Schiff base ligand H2L on reaction with Mn(CH3COO)2 · 4H2O affords a chiral Mn(IV) compound [MnL2] · DMF (1). Crystal structure analysis of compound 1 revealed an interesting O⋯O non-covalent, non-hydrogen bonded interaction between –NO2 groups present on adjacent [MnIVL2] complex units which leads to the formation of chainlike arrangement in the crystal lattice of the relevant complex. This is the first report of ONO⋯ONO non-covalent interactions in an inorganic complex.Figure optionsDownload full-size imageDownload as PowerPoint slide