| A series of mixed-ligand coordination complexes,namely[Zn(CA)2(BIE)](1), [Zn(OX)(BIE)]·H2O(2),[Zn2(m-BDC)2(BIE)2](3),[Cd(m-BDC)(BIE)](4), [Cd(5-OH-m-BDC)(BIE)](5),[Zn(5-OH-m-BDC)(BIE)](6),[Zn2(p-BDC)2(BIE)2]·2.5H2O (7),[Cd3(p-BDC)3(BIE)](8),[Cd3(BTC)2(BIE)2]·0.5H2O(9)and[Zn(BTCA)0.5(BIE)](10), where CA=cinnamate anion,OX=oxalate anion,m-BDC=1,3-benzenedicarboxylate anion, 5-OH-m-BDC=5-OH-1,3-benzenedicarboxylate anion,p-BDC=1,4-benzenedicarboxylate anion,BTC=1,3,5-benzenetricarboxylate anion,BTCA=1,2,3,4-butanetetracarboxylate anion,and BIE=2,2'-bis(1H-imidazolyl)ether,were synthesized under hydrothermal conditions.In 1,a pair of BIE ligands bridge adjacent Zn(Ⅱ)atoms to give a centrosymmetric dimer.In 2 and 3,BIE ligands connect Zn(Ⅱ)-carboxylate chains to form hcb and aql nets, respectively.In 4 and 5,m-BDC and 5-OH-m-BDC bridge Cd(Ⅱ)atoms to give dimeric units, respectively,which are further linked by BIE ligands to form aql networks with the node defined by a dimer of Cd(Ⅱ).In 6,the BIE ligands extend the Zn(Ⅱ)-carboxylate chains into 2D sinusoidal-like aql layers.The undulated aql polycatenate each other in the parallel manner with DOC=2,yielding a rare 2D→3D parallel polycatenation net.In 7,the BIE and p-BDC ligands link the Zn(Ⅱ)atoms to give a unique 3-fold interpenetrated(103)-b ths 3D network with a rare(102·104·104)topology.8 contains unusual edge-sharing polyhedral rods formed by[Cd3(CO2)6]clusters.Each rod is connected by the benzene rings of p-BDC in four directions into aα-Po topology.In 9,two kinds of different 2D Cd-BTC layers are alternately linked each other by sharing Cd(Ⅱ)centers to form a 3D framework,which is further linked by two kinds of BIE ligands to produce a complicated 3D polymeric structure.10 possesses a unique(3,4)connected 3D framework with(83)2(85·10)topology.The structural differences described indicate the importance of carboxylate ligands and metals in framework formation of the coordination complexes.The infrared spectra,thermogravimetric(2 and 6-10)and luminescent properties were also investigated in detail for the compounds. |
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