title: Studies on bis(3,5-di-t-butyl-1,2-benzoquinone 1-oximato)manganese(II) and its mixed-ligand complexes.
abstract: The synthesis, spectroscopy, and redox-reactivity towards PPh(3) of bis(3,5-di-t-butyl-1,2-benzoquinone 1-oximato)manganese(II), Mn(ox)(2), and its mixed-ligand complexes, Mn(ox)L(x) [L(x)=8-hydroxyquinolinato (L(1)), 2,2'-bipyridine (bpy) (L(2)), 1,10-Phenanthroline (phen) (L(3)) and N-(2-hydroxyphenyl)-3,5-di-t-butylsalicylaldiminato (L(4))] complexes, are presented. While some complexes exhibit solid-state ESR spectra they were ESR-silent in toluene or CHCl(3) at 300 K. The reduction of all ESR-silent complexes with an excess of PPh(3), independently from the nature of secondary L(x) ligands, results in the appearance of a six-line hyperfine coupling of 55Mn (I=5/2) (A(Mn)=95-100 G) and a seven-line radical signal, which was assigned to phosphiniminophenoxyl type radicals (g=2.0056-2.0075, A(P)=8. 5 G and A(N)=1.875 G).
authors.affiliation: Chemistry Department, Faculty of Arts and Sciences, Harran University, 63300, Sanhurfa, Turkey. vkasumov@harran.edu.tr
authors.forename: Veli T
authors.initials: VT
authors.lastname: Kasumov
authors.forename: Fevzi
authors.initials: F
authors.lastname: Köksal
mesh_terms: D016227:Benzoquinones / Q000032:analysis / Q000737:chemistry*; D002725:Chloroform / Q000494:pharmacology; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D008024:Ligands; D008345:Manganese / Q000032:analysis / Q000737:chemistry*; D008956:Models, Chemical; D009942:Organometallic Compounds / Q000032:analysis / Q000737:chemistry*; D010084:Oxidation-Reduction; D014050:Toluene / Q000494:pharmacology
chemical_list: D016227:Benzoquinones; D008024:Ligands; D009942:Organometallic Compounds; C479862:bis(3,5-di-t-butyl-1,2-benzoquinone 1-oximato)manganese(II); D014050:Toluene; C004532:quinone; D008345:Manganese; D002725:Chloroform