The dipeptide-based chiral binuclear complex capturing 4,4′-bipyridine to form a 3D supramolecular framework with a 1D channel

Abstract

The self assembly of glycyl-L-alanine, Cu(NO₃)₂·3H₂O and 4,4′-bipyridine gave a chiral binuclear complex capturing uncoordinated 4,4′-bipyridine through weak hydrogen-bonding and π–π interactions to form a 3D supramolecular framework with a 1D chiral channel, [Cu₄(C₅H₈N₂O₃)₄ (H₂O)₄(C₁₀H₈N₂)₂]·(C₁₀H₈N₂)·8H₂O (1). Racemic glycyl-D,L-alanine gave a centrosymmetric binuclear complex [Cu₂(C₅H₈N₂O₃)₂ (H₂O)₂(C₁₀H₈N₂)]·8H₂O (2) in which a 1D double-chain of water molecules is anchored. The orientation of functional groups of dipeptides in binuclear units plays a subtle role in structural differences. The uncoordinated 4,4′-bipyridine plays a cooperative role in forming the extended supramolecular framework of 1.