title: A spin-frustrated star-shaped heterotetranuclear CrIIIMnII3 species and its magnetic and HF-EPR measurements.
abstract: A tetranuclear complex [Cr(III)Mn(II)(3)(PyA)(6)Cl(3)] 1 containing pyridine-2-aldoximato monoanion, PyA, has been structurally and magnetochemically characterized. The compound is a rare example of a tetranuclear star-shaped metal topology containing pyridine-2-aldoximato ligands. Static magnetic studies have demonstrated very weak antiferromagnetic exchange interactions between the paramagnetic centers (S(Cr) = 3/2 and S(Mn) = 5/2) resulting in closely spaced low-lying levels, which undergo splitting and crossing. Preliminary high-field EPR measurements (20 < nu < 388 GHz) indicate the presence of zero-field splitting D of the order of 0.7 cm(-1).
authors.affiliation: Max-Planck-Institute for Bioinorganic Chemistry, D-45470, Mülheim an der Ruhr, Germany.
authors.forename: Sumit
authors.initials: S
authors.lastname: Khanra
authors.forename: Biplab
authors.initials: B
authors.lastname: Biswas
authors.forename: Christian
authors.initials: C
authors.lastname: Golze
authors.forename: Bernd
authors.initials: B
authors.lastname: Büchner
authors.forename: Vladislav
authors.initials: V
authors.lastname: Kataev
authors.forename: Thomas
authors.initials: T
authors.lastname: Weyhermüller
authors.forename: Phalguni
authors.initials: P
authors.lastname: Chaudhuri
mesh_terms: D002857:Chromium / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010091:Oximes / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D009942:Organometallic Compounds; D010091:Oximes; D002857:Chromium; D008345:Manganese; C060977:pyridine-2-aldoxime