title: Spectroscopic and conductometric studies of molecular complex formation between 2,4,6-trinitrophenol and diaza-18-crown-6, tetraaza-14-crown-4 and cryptand C222 in 1,2-dichloroethane solution.
abstract: The formation of molecular complexes between 2,4,6-trinitrophenol (TNP) and aza-substituted macrocycles diaza-18-crown-6 (DA18C6), tetraaza-14-crown-4 (TA14C4) and cryptand C222 in 1,2-dichloroethane solution was investigated spectrophotometrically and conductometrically. The mole ratio and continuous variations studies based on both physicochemical techniques employed clearly revealed the formation of both 1:1 and 2:1 (TNP:macrocycle) adducts in solution. Formation of the resulting complexes was also confirmed by 1H NMR and IR spectroscopic studies. Formation constants of the resulting complexes were evaluated from computer fitting of the corresponding mole ratio data. Stability of the resulting complexes was found to vary in the order C222 approximately TA14C4 > DA18C6.
authors.affiliation: Department of Chemistry, Bu-Ali Sina University, Hamadan, Iran.
authors.forename: Masoumeh
authors.initials: M
authors.lastname: Hasani
authors.forename: Mohsen
authors.initials: M
authors.lastname: Irandoust
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shamsipur
mesh_terms: D043844:Crown Ethers / Q000737:chemistry*; D004553:Electric Conductivity; D004988:Ethers, Cyclic / Q000737:chemistry*; D005025:Ethylene Dichlorides / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D010851:Picrates / Q000737:chemistry*; D011522:Protons; D012545:Schiff Bases / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D043844:Crown Ethers; D004988:Ethers, Cyclic; D005025:Ethylene Dichlorides; D006571:Heterocyclic Compounds; D010851:Picrates; D011522:Protons; D012545:Schiff Bases; D012996:Solutions; C444241:cryptand; C509110:tetraaza-14-crown-4; C015762:18-crown-6; C005858:picric acid