Solvent Extraction of Perrhenate with 25,26,27,28-Tetrakis[(ethoxycarbonyl)methoxy]-p- tert-Butylcalix[4]arene and Crystal Structure of the Extracted Complex

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• 作者：Zhixian Zhou ; Yanjun Xing and Yangjie Wu
• 关键词：extraction ; perrhenate ; calix[4]arene ; crystal structure
• 刊名：Journal of Inclusion Phenomena and Molecular Recognition inChemistry
• 出版年：1999
• 出版时间：1999
• 年：1999
• 卷：34
• 期：2
• 页码：221-233
• 全文大小：104 KB

文摘

The extraction of perrhenate with 25,26,27,28-tetrakis[(ethoxycarbonyl)methoxy]-p-tert-butylcali x[4]arene ( L) into 1,2-dichloroethane was investigated. The presence of Na+ in the aqueous phase is necessary for the extraction. The extraction equilibrium has been established and the thermodynamic quantities H°, TS° and log Kex are -61.3 kJ/mol, -41.4 kJ/mol and 3.69, respectively. The effect of diverse ions on the extraction of ReO4- was studied. The corresponding extracted complex [Na L]ReO4...H2O was prepared and characterized by EA, IR and X-ray structure analysis. The complex crystallizes in the tetragonal space group P4ncc with a = b = 14.735(3), c = 29.094(3) Å, V = 6316(2) Å3, Z = 4.