title: Manganese(II) chemistry of a new N3O-donor chelate ligand: synthesis, X-ray structures, and magnetic properties of solvent- and oxalate-bound complexes.
abstract: The synthesis and characterization of a new N3O donor ligand N-benzyl-N-((6-pivaloylamido-2-pyridyl)methyl)-N-(2-pyridylmethyl)amine (bpppa) is reported. Treatment of bpppa with Mn(II)(ClO4)2.6H2O in acetonitrile solution yielded the mononuclear [(bpppa)Mn(CH3CN)(H2O)](ClO4)2 (1) which was characterized by X-ray crystallography, elemental analysis, IR spectroscopy, mass spectrometry, and a solution magnetic moment measurement. Admixture of equimolar equivalents of bpppa and Mn(II)(ClO4)2.6H2O in methanol solution, followed by addition of 0.5 or 1 equivalents of sodium oxalate, yielded the binuclear complex [{(bpppa)Mn}2([mu]-C2O4)](ClO4)2 (2), which was characterized by X-ray crystallography, elemental analysis, IR spectroscopy, mass spectrometry, and solid-state magnetic measurements. While 1 is mononuclear, the formation of the binuclear oxalate derivative indicates that use of the bpppa ligand does not enable isolation of a complex that is structurally relevant to a proposed 1:1 Mn(II)-oxalate adduct in the catalytic cycle of the oxalate degrading enzyme oxalate decarboxylase.
authors.affiliation: Department of Chemistry and Biochemistry, Utah State University, Logan, UT 84322-0300, USA.
authors.forename: Amy L
authors.initials: AL
authors.lastname: Fuller
authors.forename: Rex W
authors.initials: RW
authors.lastname: Watkins
authors.forename: Kim R
authors.initials: KR
authors.lastname: Dunbar
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Prosvirin
authors.forename: Atta M
authors.initials: AM
authors.lastname: Arif
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Berreau
mesh_terms: D001593:Benzyl Compounds / Q000138:chemical synthesis*; D002262:Carboxy-Lyases / Q000737:chemistry / Q000378:metabolism; D002384:Catalysis; D002413:Cations, Divalent; D002614:Chelating Agents / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D010070:Oxalates / Q000138:chemical synthesis*; D011725:Pyridines / Q000138:chemical synthesis*; D012997:Solvents / Q000737:chemistry; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D001593:Benzyl Compounds; D002413:Cations, Divalent; D002614:Chelating Agents; D008024:Ligands; C516881:N-benzyl-N-((6-pivaloylamido-2-pyridyl)methyl)-N-(2-pyridylmethyl)amine; D009942:Organometallic Compounds; D010070:Oxalates; D011725:Pyridines; D012997:Solvents; D008345:Manganese; D002262:Carboxy-Lyases; C021915:oxalate decarboxylase