title: New insights into the thermal stability of Mn12 clusters: the case of complex [Mn12O12(O2CC[triple bond]-CH)16(H2O)4] x 3H2O and its thermolysis derived [Mn3(O2CC[triple bond]CH)6(H2O)4] x 2H2O complex.
abstract: Two novel Mn12 derivatives [Mn12O12(O2CC[triple bond]CH)16(H2O)4] x 3H2O (1) and [Mn12(O2CC[triple bond]CC6H5)16(H2O)4] x 3H2O (2) have been prepared and characterized. Magnetic measurements confirm that both function as single-molecule magnets (SMM), showing frequency-dependent out-of-phase AC susceptibility signals and magnetization hysteresis curves. Thermal stability studies of both complexes were first conducted in the solid state. While complex 1 undergoes a sudden exothermal decomposition at T(onset) = 118 degrees C, complex 2 exhibits a higher stability. Thermolysis reaction of 1 was hence assessed in solution to yield dark red crystals of a two-dimensional Mn(II)-based co-ordination polymer [Mn3(O2CC[triple bond]CH)6(H2O)4] x 2H2O (3), which corresponds to an extended sheet-like structure that crystallizes in the monoclinic space group P2(1)/n; a = 9.2800(2) angstroms, b = 9.4132(2) angstroms, c = 14.9675(3) angstroms, beta = 99.630(1) degrees, and Z = 2. Finally, the magnetic properties of complex 3 have been studied on an oriented single crystal over two different orientations of the reciprocal vector versus the external field.
authors.affiliation: Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de la UAB, 08193 Bellaterra, Catalonia, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Gómez-Segura
authors.forename: Javier
authors.initials: J
authors.lastname: Campo
authors.forename: Inhar
authors.initials: I
authors.lastname: Imaz
authors.forename: Klaus
authors.initials: K
authors.lastname: Wurst
authors.forename: Jaume
authors.initials: J
authors.lastname: Veciana
authors.forename: Philippe
authors.initials: P
authors.lastname: Gerbier
authors.forename: Daniel
authors.initials: D
authors.lastname: Ruiz-Molina