Structural diversity in Cu(II), Cd(II) and Hg(II) coordination complexes with the rigid N,N′-bis(2/3-aryl)-1,4-benzenedicarboxamide ligand |
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| Authors: | Ta-Pin Tsai Yen-Tsang Huang Umasankar Ray Yin-Jui Chang Pei-Chi Cheng Chia-Jun Wu Jhy-Der Chen Ju-Chun Wang |
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| Institution: | 1. Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan, ROC;2. Department of Chemistry, Soochow University, Taipei, Taiwan, ROC |
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| Abstract: | The syntheses and structures of a series of metal complexes, namely Cu2Cl4(L1)(DMSO)2·2DMSO (L1 = N,N′-bis(2-pyridinyl)-1,4-benzenedicarboxamide), 1; {Cu(L2)1.5(DMF)2]ClO4]2·3DMF}∞ (L2 = N,N′-bis(3-pyridinyl)-1,4-benzenedicarboxamide), 2; {Cd(NO3)2(L3)]·2DMF}∞ (L3 = N,N′-bis-(2-pyrimidinyl)-1,4-benzenedicarboxamide), 3; {HgBr2(L3)]·H2O}∞, 4, and {Na(L3)2]Hg2X5]·2DMF}∞ (X = Br, 5; I, 6) are reported. All the complexes have been characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. Complex 1 is dinuclear and the molecules are interlinked through S?S interactions. In 2, the Cu(II) ions are linked through the L2 ligands to form 1-D ladder-like chains with 60-membered metallocycles, whereas complexes 3 and 4 form 1-D zigzag chains. In complexes 5 and 6, the Na(I) ions are linked by the L3 ligands to form 2-D layer structures in which the Hg2X5]− anions are in the cavities. The L2 ligand acts only as a bridging ligand, while L1 and L3 show both chelating and bridging bonding modes. The L1 ligand in 1 adopts a trans-anti conformation and the L2 ligand in 2 adopts both the cis-syn and trans-anti conformations, whereas the L3 ligands in 3–6 adopt the trans conformation. |
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| Keywords: | Amide Coordination polymer Hydrogen bonding Pyridine Pyrimidine Supramolecular structure |
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