Coordination Chemistry of Calix[4]arene-biscrown-6 with Cs~+ in Solution

Abstract

Abstract: The coordination chemistry of Calix[4]arene-biscrown-6(BisC₆) with Cs⁺ was studied in solution. The extraction experiments demonstrated that Cs⁺ extracting percentage at the single stage was 99.36% in o-nitrophenyl methyl ether(NPME) at room temperature. In simulated HLLW, the separation factor of Cs⁺/Na⁺ and Cs⁺/K²⁺ is 3.92×10⁴ and 2.21×10⁴ respectively. The local structure model of the complex showed that HNO₃ or H₂O might be located in the complexes. ESI-MS showed that the cesium ion complex with BisC₆ might form both 1:1 (mononuclear) and 2:1 (bisnuclear) Cs⁺: ligand species and [BisC₆·H₂O], [BisC₆·Cs⁺]⁺, [BisC₆·2Cs⁺·H₂O]²⁺, [BisC₆·2Cs⁺·NO-₃]⁺ etc. might exist in BisC₆/NPME/HNO₃ system. The EXAFS results indicated that the coordination number of cesium in BisC₆ was seven and the complex structure with seven-oxygen coordination was stable. ADF computation verified the EXAFS results.

Key words: Calix[4]arene-biscrown-6, Coordination chemistry, Cs⁺

CLC Number:

O641.4

TrendMD:

GAO Jian-Xun, WANG Bing-Wu, ZHANG Lin, WANG Jian-Chen, SONG Chong-Li LIU Tao, HU Tian-Dou, XIE Ya-Ning, ZHANG Jing . Coordination Chemistry of Calix[4]arene-biscrown-6 with Cs~+ in Solution[J]. Chem. J. Chinese Universities, 2005, 26(3): 471.

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