title: Temperature dependence of X- and Q-band EPR spectra of the dinuclear manganese(II) complex [(NO2Bpmp)Mn2(mu-OAc)2]+: determination of the exchange constant and of the spin parameters for the S=1, 2, and 3 spin states.
abstract: A new dinuclear manganese(II) complex was synthesised with the biscompartimental ligand 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-nitrophenol (NO(2)BpmpH) and characterised by X-ray crystallography. Magnetic susceptibility measurements revealed that the two high-spin Mn(II) ions are antiferromagnetically coupled with a singlet-to-triplet separation of 7.2 cm(-1). The powder EPR spectra were recorded for both X- and Q-bands between 1.8 K and 35 K. A detailed analysis of these spectra led to the determination of three out of five individual spin-state zero-field splitting parameters. From the proposed simulations, the exchange coupling constant J and the intermetallic distance have been computed.
authors.affiliation: Laboratoire de Chimie Inorganique UMR 8613, LRC-CEA n degrees 33V Institut de Chimie Moléculaire et des Matériaux d'Orsay Bâtiment 420, Université Paris-Sud 91405 Orsay Cedex, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Blanchard
authors.forename: Guillaume
authors.initials: G
authors.lastname: Blain
authors.forename: Eric
authors.initials: E
authors.lastname: Rivière
authors.forename: Martine
authors.initials: M
authors.lastname: Nierlich
authors.forename: Geneviève
authors.initials: G
authors.lastname: Blondin