title: Pb(II) coordination and synergistic ion-exchange extraction by combinations of sulfonamide chelates and 2,2'-bipyridine.
abstract: The disulfonamide ligands 1,2-C(6)H(4)(NH(2)SO(2)C(6)H(5))(2) (1) and 1,2-C(6)H(4)(NH(2)SO(2)C(6)H(4)-p-Bu(t))(2) (2), which are readily available in good yields from o-phenylenediamine and the corresponding sulfonyl chlorides, efficiently extract Pb(II) from water into 1,2-dichloroethane when used in synergistic combinations with 2,2'-bipyridine via an ion-exchange mechanism. The extraction was shown to proceed via the formation of a ternary Pb-sulfamido-2,2'-bipyridine complex. The X-ray crystal structure of the binary Pb-sulfamido complex 3 shows a coordination polymer with a stereochemically active lone pair on Pb formed by S=O-Pb axial coordination.
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, USA. kavallie@fiu.edu
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Kavallieratos
authors.forename: Jay M
authors.initials: JM
authors.lastname: Rosenberg
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: Bryan
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D002413:Cations, Divalent; D002614:Chelating Agents / Q000737:chemistry; D005025:Ethylene Dichlorides / Q000737:chemistry; D007474:Ion Exchange; D007854:Lead / Q000737:chemistry*; D008024:Ligands; D015394:Molecular Structure; D013449:Sulfonamides / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D002614:Chelating Agents; D005025:Ethylene Dichlorides; D008024:Ligands; D013449:Sulfonamides; D014867:Water; D007854:Lead; C024565:ethylene dichloride; D015082:2,2'-Dipyridyl