Synthesis and Crystal Structure of 2D Mn(II) Complex with Flexible Phenylenediacetic Ligand

A coordination polymer of Mn-II with flexible ligands, namely [Mn(pda)(bpp)] (1) (H(2)pda=1,3-phenylenediacetic acid, bpp=1,3-bi(4-pyridyl)propane), was synthesized and characterized by single-crystal X-ray diffraction, elemental analysis and IR spectroscopy. The results of structure characterization indicate that the complex crystallizes in the orthorhombic space group Pnna with a=1.965 2(6) nm, b=1.103 3(4) nm, c=0.963 9(3) nm, alpha=beta=gamma=90.0 degrees, V=2.089 8(12) nm(3), Z=4, D-c=1.416 Mg.m(-3), mu=0.664 rnm-4, F(000)=924, and final R-1=0.040 2, wR(2)=0.133 2. The crystal structure of complex 1 consists of one Mn-II, one 1,3-pda ligand and one bpp ligand. The bpp ligands bridge the Mn ions to form a one-dimensional (1D) right-handed helical chain along the crystallographic b direction. Moreover, these helical chains are united together through the 1,3-pda ligands to afford a two-dimensional (2D) helical layer. Further investigation of this 2D structure suggests that the Mn centers are connected to each other by bpp to afford a 1D zigzag chain along the crystallographic c direction. The 1D zigzag chains are interlinked by the 1,3-pda anions, constituting step-shaped 2D (4,4) network. In addition, thermal stability and electrochemistry of 1 have also been studied. CCDC: 885051.