CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
artículos
Título:
Synthesis, Crystal Structure, and Properties of Mn(PO3F)(H2O)2
Autor/es:
M. WEIL; BARAN, ENRIQUE JOSÉ; R. K. KREMER; E. LIBOWITZKY
Revista:
Zeitschrift fuer Anorganische und allgemeine Chemie
Editorial:
Wiley-VCH
Referencias:
Lugar: Weinheim; Año: 2015 vol. 641 p. 184 - 184
ISSN:
1521-3749
Resumen:
Single crystals of manganese(II) fluorophosphate dihydrate, Mn(PO3F)(H2O)2, were grown in a metathesis reaction from aqueous solutions of MnCl2 and (NH4)2(PO3F). The crystal structure [P1¯, Z = 2, a = 5.5280(7), b = 5.6357(7), c = 8.2570(10) Å, α = 81.279(2), β = 75.156(2), γ = 71.722(2)°, 1345 structure factors, 86 parameter, R[F2  2σ(F2)] = 0.0322, wR(F2 all) = 0.0771] consists of [MnO4(H2O)2] octahedra that share a common edge to form isolated double octahedra of the type [Mn2O2/2O4/1(H2O)4/1]. Each double octahedron is bridged by the oxygen atoms of six (PO3F) tetrahedra to six neighboring double octahedra into a layered arrangement parallel to (001). Adjacent layers are held together through weak O?H···O hydrogen bonds, and no significant hydrogen bonding interactions of the type O?H···F are observed. Vibrational spectra are discussed in terms of a site-symmetry approximation for the (PO3F)2? anion. The thermal decomposition of Mn(PO3F)(H2O)2 starts above 130 °C. In a multi-stage mechanism the end-product Mn2P2O7 is formed at temperatures above 500 °C. Magnetic measurements suggest an antiferromagnetic ordering of Mn(PO3F)(H2O)2 at 3.4 K.
rds']