Formation of bilayer structure through face-to-face π–π interactions

Self-assembly of Cd(NO3)2·4H2O and N,N′,N′′-tris(4-pyridinylmethyl)-1,3,5-benzene tricarboxamide (L) in DMF and further diffusion into ether furnished a new 2D coordination polymer, [CdL2(NO3)2]. 2DMF (1) having noninterpenetrating honeycomb-like layer with (6,3) topology containing 54-membered rings and was characterized by elemental analyses, FT-IR, TGA and X-ray crystallography. These 2D sheets stack through face-to-face π–π interactions between central benzene rings and hydrogen bonding to form a bilayer structure. This type of perfect face-to-face π–π interactions (termed as Piedfort assemblies) are rare between benzene rings and its derivatives.