title: Spectral and thermal study on the adduct formation between square planar nickel(II) chelates and some bidentate ligands.
abstract: Adducts of Ni(II)-square planar complexes [Ni(beta-dik)(Me(4)en)](+), with a series of bidentate ligands (L), where beta-dik=acetylacetonate (acac) and benzoylacetonate (bzac), Me(4)en=N,N,N',N'-tetramethylethylenediamine and L=Me(4)en, 2,2'-bipyridine (bipy), ethylenediamine (en) and oxalate (C(2)O(4)(2-)) have been synthesized and characterized by spectral, thermal and magnetic measurements. Formation constants of the adducts formed from a series of ternary mixed Ni(II) complexes with the general formula [Ni(beta-dik)(diam)](+) with 1,10-phenanthroline (phen), 2,2'-bipyridine (bipy) and pyridine were spectrophotometrically determined. Thermodynamic parameters of the adduct formation between nickel(II) square-planar chelates and pyridine (py), 2,2'-bipyridine (bipy) and acetylacetone (acac) were also spectrophotometrically determined in 1,2-dichloroethane. The thermal stability of the isolated adducts was studied using thermogravimetry and the decomposition schemes of the adducts were given.
authors.affiliation: Department of Chemistry, Faculty of Science, UAE University, P.O. Box 17551, Al-Ain, United Arab Emirates. ahmed.soliman@uaeu.ac.ae
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Soliman
authors.forename: Ali
authors.initials: A
authors.lastname: Taha
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Linert
mesh_terms: D002614:Chelating Agents / Q000494:pharmacology*; D006358:Hot Temperature; D007659:Ketones / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D011208:Powders; D013053:Spectrophotometry / Q000379:methods*; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D002614:Chelating Agents; D007659:Ketones; D008024:Ligands; D011208:Powders; D009532:Nickel