title: Electron exchange columns through entrapment of a nickel cyclam in a sol-gel matrix.
abstract: An electron exchange column (analogous to ion exchange columns) was developed using the unique redox properties of the nickel-tetraazamacrocyclic complexes (nickel cyclam [Ni(II)L(1)](2+)) and nickel-trans-III-meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, ([Ni(II)L(2)](2+)), and the physical and chemical stability of the ceramic materials using the sol-gel process to entrap the complexes. The entrapment by the biphasic sol-gel method is based on non-covalent bonds between the matrix and the complex; therefore the main problem was leaching. Parameters controlling the leaching were investigated. Redox cycles with the reducing agent ascorbic acid, and persulfate as the oxidizing agent were performed.
authors.affiliation: Chemada fine chemicals Ltd, Israel.
authors.forename: Yair
authors.initials: Y
authors.lastname: Lavi
authors.forename: Ariela
authors.initials: A
authors.lastname: Burg
authors.forename: Eric
authors.initials: E
authors.lastname: Maimon
authors.forename: Dan
authors.initials: D
authors.lastname: Meyerstein
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry; D002852:Chromatography, Ion Exchange; D018360:Crystallography, X-Ray; D004583:Electrons; D005782:Gels; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry
chemical_list: C419508:(1,4,8,11-tetraazacyclotetradecane)nickel(ii) perchlorate; D005782:Gels; D006571:Heterocyclic Compounds; D009942:Organometallic Compounds; D013431:Sulfates; C024560:cyclam; D009532:Nickel; D001205:Ascorbic Acid