Construction of Cd(ii) coordination polymers used as catalysts for the photodegradation of organic dyes in polluted water

• Published in: CrystEngComm 2014-01, Vol.16 (11), p.2158-2167
• Main Authors: Li, Duan-Xiu, Ni, Chun-Yan, Chen, Min-Min, Dai, Ming, Zhang, Wen-Hua, Yan, Wen-Yan, Qi, Hai-Xiao, Ren, Zhi-Gang, Lang, Jian-Ping
• Format: Article
• Language: English
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/c3ce42360c

Four Cd(ii) coordination polymers formulated as {[Cd sub(3)(tpcb) sub(2))( eta , eta - mu -SO sub(4)) sub(2)(H sub(2)O) sub(6)]SO sub(4). 16H sub(2)O} sub(n) (1), {[Cd(tpcb) sub(0.75)(OH)(H sub(2) O) sub(2)](NO sub(3))} sub(n) (2), {[Cd sub(2)(tpcb)(SO sub(4)) sub(2)(H sub(2)O) sub(6)].2MeOH.3H sub(2)O} sub(n) (3), and {[Cd(tpcb)(NO sub(3))(H sub(2)O) sub(2)](NO sub(3))} sub(n) (4) were synthesized by reactions of CdSO sub(4) or Cd(NO sub(3)) sub(2) with tetrakis(4-pyridyl)cyclobutane (tpcb) under solvothermal conditions or at ambient temperature. Compounds 1-4 were characterized by elemental analysis, IR spectroscopy, thermal analysis, powder X-ray diffraction analysis and single crystal X-ray diffraction. Compounds 1, 2, and 4 possess three different complicated 3D frameworks with the Schlaefli symbols of (4 super(6))(4 super(12).5 super(4).6 super(4).8 super(8)), (6 super(3)) sub(4)(6 super(2).8 super(4)) sub(3 ) and (8 super(3))(8 super(6)), respectively, while 3 presents a 1D chain structure. Compounds 1-4 exhibited relatively good photocatalytic activity towards the degradation of methyl orange (MO), methyl blue (MB) and rhodamine B (RhB) in aqueous solution. These results offered a good insight into the temperature effects on the assembly of Cd(ii) coordination polymers and their photocatalytic applications.