title: Low temperature neutron diffraction studies in [Mn3(suc)2(ina)2]n: an homometallic molecular 3D ferrimagnet.
abstract: Neutron diffraction techniques have been used to determine the low temperature crystal structure and to shed light on the magnetic behavior of the [Mn(3)(suc)(2)(ina)(2)](n) (suc = succinate and ina = isonicotinate) complex. The ferromagnetic signal observed below T(c) ≈ 5 K in this compound is due to a noncompensation of homometallic spins in the 3D framework. The Mn(II) magnetic moments obtained from neutron diffraction refinements are slightly lower than those observed for isolated Mn(II) ions; this can be due to covalent spin delocalization or geometrical magnetic fluctuations. A small discrepancy between the value of the magnetic moments of each Mn(II) site is also observed [Mn(1) 4.1(2) μ(B) and the Mn(2) 3.9(1) μ(B)]. These differences between the theoretical and observed manganese magnetic moments are not unexpected in this large spin metal complex, and qualitatively reasonable given the synergistic interaction between the metal ions through oxo-bridge. The competition among different interactions, principally those covalent through organic ligands and dipolar interaction, drive to a final 3D ferrimagnetic order.
authors: Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009, Zaragoza, Spain. fabelo@ill.fr
authors: Oscar
authors: O
authors: Fabelo
authors: Laura
authors: L
authors: Cañadillas-Delgado
authors: Inés Puente
authors: IP
authors: Orench
authors: J Alberto
authors: JA
authors: Rodríguez-Velamazán
authors: Javier
authors: J
authors: Campo
authors: Juan
authors: J
authors: Rodríguez-Carvajal