Four new rare-earth compounds, [Eu(NDC)1.5(DMF)2] (1), [Nd2(NDC)3(DMF)4]·H2O (2), [La2(NDC)3(DMF)4]·0.5H2O (3), and [Eu(BTC)(H2O)] (4), where NDC = 1,4-naphthalenedicarboxylate, BTC = 1,3,5-benzenetricarboxylate, and DMF = N,N-dimethylformamide, have been synthesized through preheating and cooling-down crystallization. Compounds 1−3 possess similar 2D structures, in which the NDC ligands link MIII (M = La, Nd, and Eu) ions of two adjacent double chains constructed by NDC ligands and dinuclear MIII building units. In compound 4, the EuIII ion is seven-coordinated by O atoms from six BTC ligands and one terminal water molecule in a distorted pentagonal-bipyramidal coordination environment. If the BTC ligand and the EuIII ion are regarded as six-connected nodes, respectively, the structure of compound 4 can be well described as a 3D six-connected net. Furthermore, compounds 1 and 4 exhibit strong red luminescence upon 355-nm excitation. Compound 2 displays interesting emissions in the near-IR region, and yel...

Structures, photoluminescence, up-conversion, and magnetism of 2D and 3D rare-earth coordination polymers with multicarboxylate linkages.

Magnetic lanthanide–transition-metal organic–inorganic hybrid materials: From discrete clusters to extended frameworks

A lanthanide metal-organic framework with high thermal stability and available Lewis-acid metal sites.

A series of interesting Co(II)−H2tbip coordination polymers incorporating different auxiliary ligands, {[Co(tbip)(bipy)(H2O)3]·0.5(bipy)·H2O}n (1), [Co(tbip)(bipy)]n (2), {[Co3(tbip)3(dpe)3]·0.5(dpe)·3H2O}n (3), [Co2(tbip)2(dpe)(H2O)]n (4), [Co2(tbip)2(bpa)(H2O)]n (5), and {[Co2(tbip)2(bpa)2]·2.5H2O}n (6) (H2tbip = 5-tert-butyl isophthalic acid; bipy = 4,4′-bipyridine; dpe = 1,2-di (4-pyridyl)ethylene; bpa = 1,2-bi(4-pyridyl)ethane) were synthesized. X-ray structural analyses of 1−6 reveal a diverse range of structures, ranging from 1D (1) to 2D (2, 6) to 3D (3, 4, 5). Complex 1 shows 1D zigzag bipy-bridged polymeric chains with the terminal tbip ligands as pendants, which are extended to a 3D hydrogen-bonded supramolecular framework involving 1D open channels which encapsulate guest bipy molecules. Polymers 2 and 6 feature similar 2D infinite layer frameworks consisting of cobalt dimers. The structure of 3 is constructed from [Co2(tbip)2]n layers, which consists of alternating left- and right-handed heli...

Self-Assembly of a Series of Cobalt(II) Coordination Polymers Constructed from H2tbip and Dipyridyl-Based Ligands

Three new uranyl−organic coordination polymers (UO2)8(NDC)12(4,4′-bipyH2)3(4,4′-bipyH)3 (1), (UO2)3O[Ag(2,2′-bipy)2]2(NDC)3 (2), and (UO2)2(NDC)2(2,2′-bipy)2 (3), where NDC = 1,4-naphthalenedicarboxylate and bipy = bipyridine, have been prepared in hydrothermal conditions. Both 1 and 2 possess a 2D structure while 3 is composed of 1D zigzag chains. In 1 there are mononuclear pentagonal-bipyramidal U−O polyhedra and 1D channels filled with 4,4′-bipy molecules, whereas in 2 there are mononuclear hexagonal-bipyramidal U−O polyhedra and tetranuclear pentagonal-bipyramidal U−O clusters which form 2D channels with occluded [Ag(2,2′-bipy)2]+ counterions. In 3 both the NDC and the bipy ligands coordinate to uranyl centers, leading to hexagonal-bipyramidal polyhedra which are connected to form 1D zigzag chains. Under UV or visible irradiation, 1 and 2 degrade rhodamine B with similar efficiency. The correlation between photocatalytic reaction rate and oxygen concentration for 1 and 2 has also been elucidated. Crys...

Preparation, structures, and photocatalytic properties of three new uranyl-organic assembly compounds.

Three new 3d-4f heterometallic coordination polymers, [Ln 2 (H 2 O) 4 M 2 (H 2 O) 2 (QA) 5 ].nH 2 O (H 2 QA = quinolinic acid; Ln = Gd, M = Ni, n = 7 (1); Ln = Gd, M = Co, n = 6.5 (2); Ln = Dy, M = Co, n = 6.5 (3)), have been synthesized through hydrothermal pretreatment and cooling-down crystallization. These compounds possess the isostructural 3D frameworks with 1 D chairlike channels along the c axis, which are occupied by noncoordinating water molecules. Crystal data: for 1, C 3 5 H 4 1 Gd 2 Ni 2 N 5 O 3 3 , orthorhombic, space group Pna2 1 , with a = 28.567(6) A, b = 14.498(3) A, c = 12.250(2) A, and Z= 4; for 2, C 3 5 H 4 0 Gd 2 Co 2 N 5 O 3 2 . 5 , orthorhombic, space group Pna2 1 , with a = 28.843(3) A, b = 14.4325(13) A, c = 12.2275(9) A, and Z = 4; for 3, C 3 5 H 4 0 Dy 2 Co 2 N 5 O 3 2 . 5 , orthorhombic, space group Pna2 1 , with a = 28.8471(14) A, b = 14.4534(10) A, c = 12.2520(7) A, and Z = 4. The magnetic behaviors for the three compounds have been investigated.

Jin Yang

Papers

Three-dimensional 3d-4f heterometallic coordination polymers: synthesis, structures, and magnetic properties.