Delving into the second supramolecular event approach: Aggregation of small metallo-supramolecular units supported by one or two types of non-covalent forces

The neutral single-stranded monohelicate [Pd(HL)]·2(CH3CN) (1) aggregates in the solid state to give an infinite 1D supramolecular chain through either the cooperative action of hydrogen bonding and π-stacking interactions or by aromatic π-stacking alone.