Adhikari, Birendra Babu published the artcileMultiple proton ionizable calixarene derivatives with different ring sizes and complexation ability as efficient ionophores for complexation and solvent extraction of trivalent indium, Category: catalysis-chemistry, the publication is Analyst (Cambridge, United Kingdom) (2011), 136(21), 4570-4579, database is CAplus and MEDLINE.
The solvent extraction behavior of multiple proton ionizable p-tert-butylcalix[4]arene and [6]arene carboxylic acid derivatives towards indium was studied along with an acyclic monomeric analog from weakly acidic media into chloroform. The extraction mechanism is ion exchange and carboxylic acid groups are adequate ligating sites for extraction The cyclic structure of calixarene ligands to accommodate the potential guest species and the cooperativity effect of multifunctional groups significantly affect the complexation behavior and calixarene derivatives are excellent extractants over the monomeric analog. The composition of the extracted complex depends on the solution pH and attempts to determine the composition of the extracted complex for the extraction of indium were stymied by complications arising from the formation of polynuclear species of indium and bridged polymeric species of calixarene carboxylic acid derivatives One mole of calix[4]arene derivative extracts 2.5 mol of indium whereas the calix[6]arene derivative tends to extract 4.0 mol of indium. The loaded indium is back extracted with 1 mol dm-3 hydrochloric acid solution Though quant. back extraction of indium was achieved from the fully loaded calix[6]arene derivative, it was only achieved up to 85% in the case of the calix[4]arene derivative
Analyst (Cambridge, United Kingdom) published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Category: catalysis-chemistry.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia