A Novel 2D→3D Network with the Coexistence of Polythreading and Inclined Polycatenation Constructed by the Tripodal Linker

A new cadmium（Ⅱ） coordination polymer with unique structure was synthesized under diffusion process by employing triangular N-containing ligand tris（4-（pyridyl） phenyi） amine （Tppa）. Complex 1 crystallizes in the space group Pbcn, with a = 28.906（3）, b = 13.5294（14）, c = 17.8727（18） A, V= 6989.7（12） A^3, C66H48CdCl2N8, Mr = 1136.42, De = 1.080 g/cm^3, F（000） = 2328, μ= 0.428 mm^-1 and Z = 4. Complex 1 features a 2D → 3D framework with the coexistence of inclined polycatenation and polythreading. In addition, the luminescent property of complex 1 was studied.

Synthesis,Structure,and Characterization of a Novel Coordination Polymer with Polythreading Feature

A novel coordination polymer 1 with formula of Zn_(2)(BDC)_(2)(TPPA) was built from 1,4-dicarboxybenzene (H_(2)BDC),tris(4-(pyridin-3-yl)phenyl)amine (TPPA),and Zn(Ⅱ) ion.It was characterized by single-crystal and powder X-ray diffraction,Fourier-transform infrared spectra (FT-IR),thermal gravimetric analysis (TGA),and UV-vis.1 crystallizes in triclinic space group P1 with a=14.589,b=14.606,c=16.108?,α=115.635~o,β=90.328~°,γ=114.662~o,V=2738.6A^(3),Z=2,M_(r)=935.52 g/mol,D_(c)=1.134 g/cm~3,F(000)=956,GOOF=1.062,the final R=0.0685 and w R=0.1817 for 7701 observed reflections with (I>2σ(I)),and R=0.0717 and w R=0.1843 for all data.In 1,Zn(Ⅱ) is coordinated with H_(2)BDC to form a 2D square grid,and TPPA ligands were arranged above and beneath the 2D layer.Two neighbor layers are interpenetrated each other byπ-πinteractions to generate a polythreading framework structure.Moreover,the photoluminescence of 1 was also studied.

A Zn(Ⅱ) Coordination Polymer Based on a Flexible Polycarboxylate Ligand 5-(4-Hydroxypyridinium-1-ylmethyl)-isophthalic Acid: Synthesis, Structure, and Property

A Zn（Ⅱ） supramolecular coordination polymer, {[Zn2（L）2（m-bix）（H20）]6H2O}n（1）, with an interesting 1D→2D polythreading array from a flexible and angular organic aromaticpolycarboxylate ligand 5-（4-hydroxypyridinium-l-ylmethyl）isophthalic acid （H2L）, and N-donorligand 1,3-bis（imidazol-l-ylmethyl）benzene （m-bix）, has been obtained under hydrothermalconditions and characterized by elemental analysis, powder X-ray diffraction （PXRD）, IR, thermalgravimetric analyses （TGA） and single-crystal X-ray diffraction. In 1, the Zn（Ⅱ） center has twocoordination geometries. One exhibits a trigonal bipyramidal coordination sphere, and the other isa tetrahedral geometry; L2- has two different coordination modes, with one connecting three Zn（Ⅱ）ions through two monodentate carboxylate groups and the monodentate hydroxyl group, and theother bridging two Zn（Ⅱ） ions through two carboxylate groups. The L2- anions connect the Zn（Ⅱ）centers forming an infinite 1D tubular structure. These 1D tubes are interconnected by the m-bixspacers to form a 2D framework. Such 2D layers are further assembled into a 3D supramolecularnetwork via hydrogen bonds. Meanwhile, the luminescent property of 1 has also been investigatedin detail.

Two Unusual Two-dimensional （4,4） Network Cadmium Coordination Polymers Based on Flexible Bis（triazole） and Rigid Benzenedicarboxylate Co-ligands

Two cadmium（II） coordination polymers {[Cd（btp）（NO2-1,3-bdc）（H2O）]·H2O}n （1） and {[Cd（btp）（1,2-bdc）（H2O）]·H2O}n （2） were synthesized by the reaction of 1,3-bis（1,2,4-triazol-1-yl）propane （btp）, 5-nitroisophthalate （NO2-1,3-bdc）, and 1,2-benzenedicarboxylate （1,2-bdc）. 1 consists of undulated 2D （4,4） networks. Two identical undulated layers are parallel stacking to give a （2D→2D） polythreaded 2D network. A 3D supramolecular architectute is constructed through the hydrogen bond interactions. 2 has an unusual 2D （4,4） network with a thickness of ca. 10A. The btp ligands exhibit the anti-gauche conformation in 1 and the anti-anti conformation in 2. The flexible btp ligand exhibits the key role in the assembly of the topologies of 1 and 2. The luminescence and thermal stability were investigated.