Syntheses,Structures And Properties Of Coordination Polymers Constructed By Bis(2-methylimidazole)Ligands

The new functional materials of imidazole coordination polymers were paid great attention because of their potential applications in the fields of gas storage,chiral separation,microelectronics,magnetism,nonlinear optics and catalysis,and their intriguing topologies.The bis(imidazole)bridging ligands have strong coordination ability and variable coordination modes in the process of self-assembly and can construct coordination polymers with intriguing topologies and interesting properties.In this thesis,thirteen coordination polymers were synthesized by the combination of flexible bis(imidazole)ligand and multicarboxylate ligands,and characterized by elementary analysis,X-Ray single-crystal analysis,IR,TG and PXRD.1.Five copper(Ⅱ)coordination polymers {[Cu4(OH)2(bix)2(1,2,4btc)2(H2O)2]·3H2O}n(1),[Cu2(bix)(ip)2]n(2),[Cu2(bix)(Meip)2]n(3),{[Cu2(bix)(pbda)2]·H2O}n(4)and{[Cu2(bix)1.5(2,5-pydc)2(H2O)]·2H2O}n(5)were synthesized with flexible 1,4-bis(2-methylimidazol-1-ylmethyl)benzene(bix)and multicarboxylicate using the hydrothermal methods.1-5 show structural versatility from a(3,5)-connected 2D network based on the[Cu2(V-OH)]dimer for 1,2-fold interpenetrating three-dimensional pcu networks for 2 and 3,an unusual 6-connected self-catenated 3D network with the topological symbol(44·610·8)for 4,to a(3,4)-connected 2D network with the point symbol of(42·6)(42·63·8)for 5.1-5 are highly efficient and universal photocatalysts for the degradation of the organic dyes methylene blue(MB),rhodamine B(RhB)and methyl orange(MO)under visible light irradiation,very stable and easily separated from the reaction system for reuse.2.Five Cd(II)coordination polymers {{[Cd3(H2O)2(bix)(btc)2]·2H2O}n(6),{[Cd2(bix)(pdc)2]·H20}n(7),{[Cd(bix)(mal)]·H20}n(8),{[Cd3(bix)3(ssal)2(H2O)2]·2H2O}n(9)and[Cd(bix)(sal)2]n(10)were synthesized with flexible bix and multicarboxylicate using the hydrothermal methods.6 is a(3,8)-connected 3D network based on the[Cd3(H2O)2]dimers.7 is the 3-fold interpenetrating 3D network structure.8 exhibits a 2D(4,4)network.9 shows a 2D(6,4)network.10 demonstrates a 1D chain structure.The luminescence of 6-10 were measured.3.Three Zn(II)coordination polymers {[Zn(bix)(male)]·H2O}n(11),[Zn2(bix)(pim)2]n(12)and[Zn(bix)(aze)]n(13)were synthesized with flexible bix and multicarboxylicate using the hydrothermal methods.11 shows a special 2D(6,3)network.12 exhibits a(3,4)-connected 3D network.13 presents a 2D(4,4)network.The luminescence of 11-13 were measured.