title: Selective complex formation of some chromogenic calix[4]arene derivatives detected by Fourier transform infrared spectroscopy 1. Solution experiments.
abstract: A calix[4]arene derivative containing ethoxycarbonylmethoxy groups in the coordination sphere and an iminopyridinium indicator group was studied by FT-IR spectroscopy in acetonitrile solution. The characteristic changes of v(C=O) stretching vibration offered an opportunity for the improvement on selectivity of the ion recognition process of this ligand. The shift of the carbonyl stretching vibration band depended on complex formation as well as on the equilibrium constants of complex formation. In the case of sodium complex, a well-defined isobestic point was detected in the v(C=O) region while altering the sodium concentration. The affinity of thallium(III) to form complex with calixarene 1 was found comparable with those of lithium, sodium or calcium. The complex was found to be an M2L type supramolecule, whereas one molecule of triethylamine was necessary for the formation of each complex.
authors.affiliation: Chemical Research Center of the Hungarian Academy of Sciences, Institute of Chemistry, H-1025 Budapest, Pusztaszeri út 59-67, Hungary. ziegler@chemres.hu
authors.forename: Ildikó
authors.initials: I
authors.lastname: Mohammed-Ziegler
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D047250:Calixarenes; D005021:Ethylamines / Q000737:chemistry; D007477:Ions; D008094:Lithium / Q000737:chemistry; D008956:Models, Chemical; D010636:Phenols / Q000032:analysis* / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013793:Thallium / Q000737:chemistry; D013997:Time Factors
chemical_list: D000097:Acetonitriles; D005021:Ethylamines; D007477:Ions; D010636:Phenols; C121325:calix(4)arene; D047250:Calixarenes; D008094:Lithium; D012964:Sodium; D013793:Thallium; D002118:Calcium; C016162:triethylamine; C032159:acetonitrile