Behavior of MnIV in the hexaniobate, telluropentaniobate and hexatantalate solutions
作者： Pavel A. Abramov , Maria M. Akhmetova , Tamara E. Romanova , Artem S. Bogomyakov , Matvey V. Fedin
DOI: 10.1016/J.ICA.2018.01.012
关键词: Chemistry 、 Aqueous solution 、 Powder diffraction 、 Crystallization 、 Electron paramagnetic resonance 、 Amorphous solid 、 Crystallography
摘要: Abstract Reactions of K7H[Nb6O19], K6[(OH)TeNb5O18] or Na8[Ta6O19] with Mn(OAc)2 in the presence H2O2 lead to formation brown solutions. In case hexaniobate crystallization gives orange crystals K9Na2[HMn(Nb6O19)2]·18·5H2O (1), characterized by XRD, XRPD and EPR. Magnetic properties stability 1 aqueous solution have been studied. The rate telluropentaniobate analogue, [Mn(TeNb5O19)2]10−, is much more slow. It relatively stable solution, though less so than complex, could not be isolated. hexatantalate reaction unstable transforms into an intractable brownish amorphous precipitate. EPR studies solids isolated from reactions [(OH)TeNb5O18]6− [Ta6O19]8− suggest oligomeric polymeric nature solids, {MnIVxOy} aggregates.
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