Abstract
Two calixarene-based coordination chains were obtained solvothermally with a bridging ligand, 5-(4-Pyridyl)-1H-1,2,4-triazole-3-thiol (L) upon the adding of triethylamine or concentrated HCl, namely, [(C2H5)3NH]2[Co4(TC4A)(L)2(SO4)2]·5(CH3OH) (CIAC-256) and [Co8(TC4A)2(L)2(SO4)3 (CH3OH)6]·2(C3H7NO)·3(CH3OH) (CIAC-257; H4TC4A = p-tert-butylthiacalix [4]arene). Both compounds are featured with some 1D wavy (or zigzag) chains. In CIAC-256, the shuttlecock-like Co4-TC4A secondary building units (SBUs) are interconnected by the L ligands into the chains while in CIAC-257, the SBUs are bridged by both the L ligands and the sulfonate anions. Both compounds are effective adsorbents for the selective removal of Hg(II) from the aqueous solution and the maximum adsorption capacities for Hg(II) are 411 mg/g for CIAC-256 and 307 mg/g for CIAC-257, respectively. Magnetic measurements suggest that all the cobalt (II) centers exhibit antiferromagnetic interactions.
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