Lin-Xia Zhou

Structural diversity for three Zn(II) coordination polymers from 4-nitrobenzene-1,2-dicarboxylate and bispyridyl ligand

Abstract Three Zn(II) complexes, [Zn2(bpp)2(FNA)2]·H2O (1), [Zn(bpp)(FNA)]·H2O (2), and Zn2(bpp)2(FNA)2 (3) (bpp = 1,3-bi(4-pyridyl)propane, H2FNA = 4-nitrobenzene-1,2-dicarboxylic acid), were synthesized and characterized by single-crystal and powder X-ray diffraction methods, IR spectroscopy, TG analyses, elemental analyses, and fluorescent analysis. In 1, the Zn(II) ions are linked by FNA anions and bpp into 2-D layers. The Zn(II) ions in 2 are bridged by FNA anions into chiral chains, which are interlinked by bpp into 3-D metal–organic framework with (65·8) CdS topology. Complex 3 features 1-D zigzag chains, which are interconnected by bpp ligands to give a 3-D framework with (6·74·8)(64·7·8) topology. Complexes 2 and 3 exhibit significant ferroelectric behavior (for 2 remnant polarization Pr = 0.050 μC cm−2, coercive field Ec = 1.13 kV cm−1, saturation of the spontaneous polarization Ps = 0.239 μC cm−2; for 3 Pr = 0.192 μC cm−2, Ec = 4.64 kV cm−1, Ps = 0.298 μC cm−2).

Tetrazoleacetic acid templated 3d-4f heterometallic-organic frameworks constructed from different ligands: structures, luminescence, magnetism and photocatalytic properties

Abstract A series of 3-D lanthanide-transition 3d-4f heterometallic complexes have been synthesized by hydrothermal route from mixtures of 2,2′-bipyridyl-5,5′-dicarboxylic acid (H2bpdc) and acetic acid (HAc) with tetrazoleacetic acid as template. The single-crystal X-ray analysis shows that nine CdLn(H2O)2Cl2(bpdc)Ac complexes (Ln = La for 1, Pr for 2, Nd for 3, Sm for 4, Eu for 5, Gd for 6, Dy for 7, Ho for 8, Er for 9) crystallized in the space group P-1 and featured three-nodal (3, 4, 6)-three connected topological frameworks. The photocatalytic behaviors imply that 1–9 have significant photocatalytic activities for degradation of RhB.