Citation: LU Xiao-Jun, ZHOU Fa-Gen, FENG Xing, XUE Sai-Feng, TAO Zhu, ZHU Qian-Jiang. Highly Selective Compounds for Lead and Cadmium：Complexation of α,α’,δ,δ’-Tetramethylcucurbit[6]uril with Transition-Metal and Heavy-Metal Ions[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(7): 1513-1520. doi: 10.3969/j.issn.1001-4861.2013.00.192 shu

Highly Selective Compounds for Lead and Cadmium：Complexation of α,α’,δ,δ’-Tetramethylcucurbit[6]uril with Transition-Metal and Heavy-Metal Ions

LU Xiao-Jun ^1,2 ,
ZHOU Fa-Gen ^1,2 ,
FENG Xing ^1,2 ,
XUE Sai-Feng ^1,2 ,
TAO Zhu ^1,2 ,
ZHU Qian-Jiang ^1,2

1.
1 Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guiyang 550025, China;

Received Date: 27 July 2012
Available Online: 25 February 2013
Fund Project: 国家自然科学基金(No.21272045)资助项目。 (No.21272045)

The complexation of α,α',δ,δ'-tetramethylcucurbit[6]uril (TMeQ[6]) complexes with transition-metal ions was studied by differential pulse voltammetry (DPV). The results reveal that this water-soluble cage-type compound shows very high selectivity for Pb²⁺ and Cd²⁺, while it is a masking compound for other transition-metal ions, particularly for Fe³⁺, Co2+, Zn2+, and Cr3+, due to a sharp decrease in the DPV peak current of these metal ions in the presence of TMeQ[6]. Binding constants were determined from voltammetric data. The Pb²⁺ and Cd²⁺ cations display a high binding affinity for TMeQ[6] (K_Pb²⁺=2.12×109 L²·mol^-2, K_Cd²⁺=2.10×10⁹ L²·mol^-2) and form 2:1 n_M²⁺/n_TMeQ[6] complexes. The crystal structure of TMeQ[6]-Pb²⁺ indicates a 2:1 (n_M²⁺/n_TMeQ[6]) complex in the solid state, which is consistent with the results in solution. CCDC: 723280.
- differential pulse voltammetry;TMeQ[6];transition-metal ions;selectivity;complexation
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