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 - 191
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.
