Assembly of one 2D layer and two 3D pillared-layer structures derived from metal ions and 5-(pyridin-4-yl)isophthalic acid with or without pillars

• 1D water chains are encapsulated in the channels formed by 2D layers of 1.
• Hemidirected coordination geometry of Pb atom is observed in 3.
• Compound 3 exhibits a 2D → 3D polycatenation network.
• The results offer an insight into effects of linker and metal ion on the structures.

Three new coordination polymers, [Mn(L)(H2O)2]2·5H2O (1), [Cu(L)(4,4′-bipy)]2·H2O (2) and [Pb(L)(4,4′-bipy)0.5] (3) (H2L = 5-(pyridin-4-yl)isophthalic acid; 4,4′-bipy = 4,4′-bipyridine) have been synthesized and characterized by IR, thermogravimetric analysis, X-ray powder diffraction and X-ray single crystal diffraction. Complex 1 shows a 2D layer structure which stacks with the other ones to form 1D channels to hold 1D water chains. Complex 2 displays a 3D + 3D → 3D polycatenation network. 3 shows a unique 2D + 2D → 3D polycatenation net in which each Pb center has a hemidirected coordination geometry due to the existence of “inert pair effect”. The thermal and luminescent properties of 1–3 were also examined.

Solvothermal reactions of MnSO4·7H2O with 5-(pyridin-4-yl)isophthalic acid (H2L) afforded one 2D layer polymer [Mn(L)(H2O)2]2·5H2O while treatment of CuSO4·5H2O or Pb(NO3)2 with H2L and 4,4′-bipy under solvothermal conditions produced two 3D pillared-layer polymers [Cu(L)(4,4′-bipy)]2·H2O and [Pb(L)(4,4′-bipy)0.5]. These complexes were structurally characterized by elemental analysis, IR, and X-ray crystallography and their thermal and luminescent properties were investigated.Figure optionsDownload as PowerPoint slide