Three new Zn(Ⅱ)/Cd(Ⅱ) coordination polymers based on 2-mercaptonicotinic acid (H2mna) with 1,2-di(4-pyridyl)ethylene (dpe) introduced as a bridging ligand have been synthesized via hydrothermal method and structurally characterized by single-crystal X-ray diffraction as well as elemental analysis and IR. As reported in this paper, [Zn2(dpe)0.5(mna)2] (1) can be classified as a two-dimensional layer structure in which the 1D chain composed of Zn(Ⅱ) and mna ligands is bridged by dpe ligands, while the complex named [Zn4(dpe)4(mna)4] (2) is a tetra-nuclear cluster compound. These two compounds are further extended to three-dimensional structures by hydrogen bonds along with C-H…π and π…π interactions. Compound 3 with general formular [Cd2(dpe)0.5(mna)2]·H2O belongs to a three-dimensional porous structure in which the 2D metal layers formed by the coordination of Cd(Ⅱ) and mna ligands are connected with the bridging of dpe ligands.
A new metal-organic framework,{[Cd(DPA)(OBA)]·(H2O)}n(1,DPA = 4,4-dipyridylamine,H2OBA = 4,4-oxybisbenzoic acid),has been synthesized and characterized by elemental analysis,IR and single-crystal X-ray diffraction.Single-crystal X-ray analysis shows that it is a 3-D framework.Complex 1 crystallizes in monoclinic,space group C2/c with a = 21.699(7),b = 12.192(4),c = 17.566(5) ,β = 105.254(5)°,V = 4483.43 3,Z = 8,Dc = 1.653 g/cm3,μ = 1.021 mm-1,F(000) = 2240,the final R = 0.0307,wR = 0.0867(I > 2σ(I)).Complex 1 exhibits a rare three-dimensional highly 8-connected LOMFOI topology with a point symbol of {424·64}.Thermogravimetric analysis shows that the decomposition temperature of the host framework of the complex is above 400 ℃.
Temperature dependent assembly of two novel Cd coordination polymers with the phen and H2 MIP ligands(phen = 1,10-phenanthrolion and H2 MIP = 5-methyl-isophthalic acid), formulated as Cd2(MIP)2(phen)2(1) and Cd3(MIP)3(H2MIP)(phen)2(2). They have been structurally characterized by single-crystal X-ray diffraction, elemental analysis, FT-IR spectra and TGA. 1 crystallizes in the monoclinic space group P2/n, while 2 crystallizes in the triclinic space group P1. 1 shows a 2D(two-dimensional) plane and 2 shows a 1D(one-dimensional) chain. In addition, their solid-state luminescent properties have also been investigated.
Two homochiral enantiomorphic 3D coordination polymers:(D-HAPA)_2[Cd_2Cs(DHAPA)(m-BDC)_4]·(EtOH)(1D)and(L-HAPA)_2[Cd_2Cs(L-HAPA)(m-BDC)_4]·(EtOH)(1L)(APA=2-amino-1-propanol,m-H_2BDC=1,3-benzenedicarboxylate),have been assembled solvothermally respectively with the induction of enantiomorphic organic small molecules(D,L-APA).1L and 1D crystallize in chiral space group P2_1 with Flack parameters of-0.012(13)and-0.07(3),respectively,and have been characterized by satisfactory elemental analysis,FT-IR spectra,CD-spectra and single-crystal X-ray diffraction.They both exhibit sqp topological net,purple fluorescence and SHG activity.
Two new metal-organic frameworks,{[Cd_2Cl(HL)(H_2O)_2·0.5H_2O]}_n(1)and{[Cd_2L(H_2O)_2]·H_2O}_n(2),have been hydrothermally synthesized with designed ligand H_4L(H_4L=1,3,5-triazine-2-iminodiacetic acid-4,6-biglycine)under the same condition except for different pH values.Single-crystal X-ray determination shows that they are 3-D frameworks.Complex 1crystallizes in monoclinic,space group P2_1/n.Complex 2 crystallizes in triclinic,space group P(?).The photoluminescence properties of those two complexes have been investigated in solid state.Complexes 2 exhibited remarkable blue luminescence emissions with high quantum yield of 40.3%.On the other hand,complexes 1 featured weak quantum yields of 13.7%.
