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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 11
BKCSDE 29(11)
November 20, 2008 

Three 1-(4-Hydroxyphenyl)-1H-1,2,4-triazole-based Cd(II) Coordination Polymers Directed by Aromatic Polycarboxylate Coligands
En Cui Yang, Fang Jia, Xiu Guang Wang, Xiao Jun Zhao*
1-(4-Hydroxyphenyl)-1H-1,2,4-triazole, Mixed-ligand, Coordination polymer
The reactions of 1-(4-hydroxyphenyl)-1H-1,2,4-triazole (hptrz) and inorganic Cd(II) salts with different aromatic polycarboxylic acids in mixed-solvent led to the formation of three new crystalline coordination polymers, {[Cd(H2O)2(hptrz)(Hbtc)]n·CH3OH·H2O} 1, [Cd2(H2O)2(hptrz)2(tp)2]n 2, and {[Cd(H2O)2(hptrz)- (OH-ip)]n·DMF·H2O} 3 (H3btc = 1,3,5-benzenetricarboxylic acid, H2tp = terephthalic acid, and OH-H2ip = 5- hydroxyisophthalic acid), which were fully characterized by elemental analysis, IR spectroscopy, single crystal X-ray crystallography, thermogravimertric analysis and luminescence spectra. Structure determination revealed that one-dimensional (1-D) polymeric chains for 1 and 3, and 2-D layered structure for 2 are significantly directed by the coordination mode of the carboxylate groups from aromatic coligands. In contrast, the terminal hptrz ligand affords its uncoordinated phenolic OH group to form classical H-bond interactions with coordinated water and/or carboxylate groups, which are responsible for the formation of 3-D supramolecular networks. In addition, the three solid coordination polymers with considerable thermal stability present strong hptrz-based fluorescence emissions at room temperature.
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