Calix [4] Ethyl Indium (iii) Extraction And Separation Of The Molecular Structure Of The Extracted Complexes

It was found that in the presence of certain amount of NaX(XBr or I), the pre-organized cationic complex 25 ,26.27,28-Tetrakis[(ethoxycarb- only)methoxy]-p-tert-butyca]ix [4]arene(L) sodium [NaL] can extract the In(III) from aqueous solution into the organic phase quantitatively, because the L can bind to Na~ to form a stable hydrophobic cationic complex NaL and the 1n3 can form hydrophobic anionic complex InX4 with X. The organic phase containing 50. Op.gImL indium can be stripped quantitatively into aqueous phase by OO2mol/L HC1. The solide complexes NaLInBr4 and NaLInl4 were obtained by saturation method. The extraction mechanism was studied by the composition analysis and characterization of the solid complexes. The difference of the slopes between the slopes obtained from saturation method and those of slope method was explained reasonably. The study has shown that the extraction system can extract In(III) with high selectivity, a large amount of ions. such as Mn(II), Ba(II), Mg(II), Co(II), Ca(II), NO3-, CL and S04those are present with indium do not affect the extraction of indium. The extraction efficiency of indium was not affected in a wide range of HCL concentrations(from 0.01 to 3.Omol dm The crystal structures of the complexes NaLInBr4 and NaLInI4 were determined by X-ray structural analysis. The structure of the complex C60H80012.NaInBr4 consists of NaL and InBr;. The Na~ lies between two planes formed by four ether oxygen(plane 1) and four carbonyl oxygen atoms (plane 2). respectively. The plane 1 and plane 2 are almost parallel and the interplanar angle between them is 3.10. All eight oxygen atoms are directed inward and bound to the sodium ion. The anionic complex InBr4 has an approximately tetrahedral configuration. Since the distance between In and Na is 7.28A, the cationic complex NaL~ and the anionic complex InBr; are linked by an electrostatic attraction to form an ion-pair. compound. The structure of the complex C60H80 0 12aInI4 ~CH3OH consists of NaL~ and ml - The N& of NaL~ lies between two planes formed by four ether oxygens(plane I) and four carbonyl oxygen atoms (plane 2), respectively. The plane I and plane 2 are almost parallel and the interplanar angle between them is I 40?The complex anion 1n14 has an approximately tetrahedral configuration. Since the distance between In and Na is 8.506A, the cationic complex NaL?and the anionic complex mI4 - are linked by an electrostatic attraction to form an ion-pair compound. Owing to the large anionic radius of V, the 1(3) of 1n14 forms a hydrogen bond with H of methylene in the calixarene framework, the bond length of C(H)-l is 3.175A. The 1(4) forms a hydrogen bond with the H of the pendant in the adjacent molecule, the bond length of C(H)-I is 3.219A. The intermolecular hydrogen bond makes the title complex self-assemble to form a one-dimensional supramolecule. It was also found that a methanol was encapsulated in the calix cavity of the complex NaLInI4-CH3 -...