Assembly of Zn/Cd coordination polymers containing helixes or polycatenane structures tuned by the tri-pyridyl-bis-amide ligands with different spacer: syntheses, structures, photoluminescent and photocatalytic propertiesElectronic supplementary information (ESI) available. CCDC 905091-905094. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c2ce26892b

• Main Authors: Wang, Xiuli, Huang, Jingjing, Liu, Lianli, Liu, Guocheng, Lin, Hongyan, Zhang, Juwen, Chen, Naili, Qu, Yun
• Format: Article
• Language: English
• ISSN: 1466-8033
• DOI: 10.1039/c2ce26892b

Four new d 10 metal-organic coordination polymers tuned by the "V"-shaped tri-pyridyl-bis-amide ligands with different spacers, namely, [Zn(L 1 )(BDC)]·H 2 O ( 1 ), [Cd(L 1 )(BDC)]·H 2 O ( 2 ), [Zn(L 2 )(BDC)] ( 3 ) and [Cd(L 2 )(BDC)] ( 4 ) (L 1 = N , N ′-bis(pyridine-3-yl)pyridine-2,6-dicarboxamide, L 2 = N , N ′-bis(pyridine-3-yl)pyridine-3,5-dicarboxamide, H 2 BDC = 1,4-benzenedicarboxylic acid) have been synthesized under hydrothermal conditions. In complexes 1 and 2 , the metal ions are linked by L 1 to form left- and right-helical Zn/Cd-L 1 chains, which are further extended into two-dimensional (2D) wave-like layers by BDC anions. In 3 , two L 2 ligands link two Zn II ions forming the Zn 2 (L 2 ) 2 loops, which are connected by BDC anions to form a (2·6 5 ) topological 2D network. In addition, the large Zn 2 (L 2 ) 2 loops are threaded by the BDC rods from above and below 2D layers so as to form 2D → 3D polyrotaxane and polycatenane structures. In 4 , the Cd II ions are linked by L 2 ligands to generate 1D double chain ribbons with Cd 2 (L 2 ) 2 loops, which are further connected by the BDC linkers to form a 3D framework. Two identical 3D frameworks interpenetrate each other in a twofold mode, giving rise to a polyrotaxane and polycatenane array, which is relative limited. The diverse structures of complexes 1-4 demonstrate that the tri-pyridyl-bis-amide ligands and the central metals have significant effect on the final structures. The thermal stability and fluorescent properties of complexes 1-4 have been investigated. In addition, the title complexes exhibit photocatalytic activity for dye methylene blue degradation under UV light. Four novel d 10 coordination polymers with different topological structures have been hydrothermally synthesized and tuned by ''V''-shaped tri-pyridyl-bis-amide ligands and central metals.