A three-dimensional(3D) coordination polymer {[Co(bdc)(dpb)]·H2O}n(1) was prepared by solvothermal reaction of 1,3-dipyridyl benzene(dpb) with deprotonated 1,3-benzenedicarboxylate(H2bdc), and was characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. It crystallizes in the monoclinic system, space group C2/c with a = 15.478(6), b = 12.865(5), c = 24.091(10) ?, β = 95.599(5)°, V = 4774(3) ?3, C24H18CoN2O5, Mr = 473.34, Dc = 1.267 g/cm3, F(000) = 1864.0, μ = 0.748 mm-1 and Z = 8. Each Co(II) ion links three bdc2- anions to form an infinitely 1D ladder-shaped chain containing binuclear [(COO)Co]2 cluster, and dpb links adjacent 1D chains to form a 3D pcu framework. In addition, the UV-vis of 1 was also studied.
A complex {[Cu(tib)_2(H_2O)_2]·(NO_3)_2}n(1) has been synthesized under N,N-dimethylacetamide(DMA) and water conditions. The structure of complex 1 was characterized by single-crystal X-ray crystallography. It crystallizes in monoclinic, space group P2_1/n with a = 10.6273(7), b = 11.4184(7), c = 13.4215(8) ?, β = 108.290(2)°, V = 1546.38(17) ?~3, Z = 2, F(000) = 798, D_c = 1.667 g/cm^3 and m = 0.786 mm^(-1). Complex 1 exhibits a 3D network due to the existence of O–H···O interaction between coordinated water and nitrate anions. Furthermore, complex 1 has a good catalytic activity for the reduction of 4-nitrophenol in Na BH4 solution.
A new cadmium(II) coordination polymer with unique structure was synthesized under diffusion process by employing triangular N-containing ligand tris(4-(pyridyl) phenyl) amine(Tppa). Complex 1 crystallizes in the space group Pbcn, with a = 28.906(3), b = 13.5294(14), c = 17.8727(18), V = 6989.7(12) 3, C66H48 Cd Cl2N8, Mr = 1136.42, Dc = 1.080 g/cm3, 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.
One new chiral metal-organic coordination polymer,[Cd_2(dpb)(H_2hfipbb)_2]_n,was obtained under hydrothermal conditions of 1,3-di(pyridineyl)benzene(dpb) and 4,4'-(hexafluoroisopropylidene)bis(benzoic acid)(H_2hfipbb). The title compound reveals a three-dimensional(3D) framework with two types of helical chains [Cd(COO)]n,which are linked each other to further form a double helical chain [Cd_2(COO)_2]_n by sharing the same Cd(Ⅱ) ions. The dpb connects the double helical chains to generate a 3D framework. These unique structures were studied by single-crystal X-ray and other spectroscopy techniques. In addition,the luminescent,fluorescence lifetime and second harmonic generation efficiency properties in the solid state have been studied.
A two-dimensional(2D) coordination polymer {[Cd2(sdb)2(dpb)2]·3H2O}n(1) was prepared by solvothermal reaction of two types of V-shaped ligands: 1,3-dipyridyl benzene(dpb) and deprotonated 4,4'-sulfonyldibenzoic acid(H2sdb). It was characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complex 1 crystallizes in the monoclinic system, space group Fdd2 with a = 46.247(10), b = 9.994(2), c = 24.267(6) , V = 11216(4) 3, C60H46Cd2N4O15S2, Mr = 1387.97, Dc = 1.559 g/cm3, F(000) = 5296.0, μ = 0.902 mm-1 and Z = 8. Each [Cd(COO)]2 cluster links four sdb2- anions to form infinitely ABAB stacked 2D wave-like sheets, in which each sheet contains the same helical chains, and the helical directions of sheets A and B are reversed. Dpb links the rest coordinated sites of [(COO)Cd]2 cluster to form a 2D network. In addition, the solid fluorescence of 1 and dpb is also studied.
Metal-organic frameworks(MOFs) have been emerging as important multifunctional hybrid materials, not only due to the diversify framework architectures, but also contribute to the rich interactions among metals, ligands and guests. Nitro explosives have important influences for environmental protection and national homeland security. In this review, a brief description of luminescent MOFs is presented, accompanied by a short comment on the four types of metal-based luminescent MOFs as sensing materials for nitro explosives detection. Then the trends and challenges of luminescent MOFs as sensing materials for nitro explosives are also prospected.
Three new 2D metal-organic frameworks, [M(BIDPE)2(bdc)2]n(M = Co for 1, Ni for 2) and [Ni(PIDPE)2(H2O)2(bdc)]n(3)(BIDPE = 4,4?-bis(imidazol-1-yl) diphenyl ether, PIDPE =4-(pyridyl)-4?-(imidazol-1-yl) diphenyl ether, bdc2- = 1,3-benzenedicarboxylate), were characterized by single-crystal X-ray diffraction, elemental analysis, PXRD, IR spectroscopy and TGA analysis.Complex 1 crystallizes in monoclinic, space group P21/n, with a = 9.1568(12), b = 16.943(2), c =15.441(2) ?, β = 104.049(2)°, V = 2323.9(5) ?~3, Dc = 1.420 g/cm^3, Mr = 993.83, F(000) = 1026, μ =0.440 mm^(-1) and Z = 2. Complex 2 crystallizes in monoclinic, space group P21/n, with a =9.1395(17), b = 17.019(3), c = 15.473(3) ?, β = 104.651(2)°, V = 2328.5(7) ?~3, Dc = 1.414 g/cm^3,Mr = 991.58, F(000) = 1024, μ = 0.487 mm-1, Z = 2. Complex 3 also belongs to the monoclinic system, space group P21/n, with a = 11.4365(16), b = 18.346(3), c = 11.7068(17) ?, β = 91.022(2)°,V = 2455.9(6) ?3, Dc = 1.422 g/cm3, Mr = 1051.66, F(000) = 1092, μ = 0.468 mm-1, Z = 2. All complexes 1, 2 and 3 are 2D layer structures constructed from intermolecular hydrogen bonds. In addition, the solid UV-vis properties of complexes 1, 2 and 3 were also studied.
