Abstract
An ionothermal synthesis study of transition metal phosphates using the ionic liquid 1-butyl-4-methylpyridinium hexafluorophosphate [C4mpy][PF6] yielded four new, different open framework manganese compounds, that is, K2Mn3(HPO4)2(PO3F)F2 (1), (NH4)2Mn3(HPO4)2(PO3F)F2 (2), KMn3(H2PO4)(HPO4)2F2 (3), and (NH4)Mn3(H2PO4)(PO3F)2F2 (4). The obtained products not only feature new framework topologies unprecedented in the family of phosphates but also interesting properties as the transition metal gives rise to both luminescent (rendering them potential nonrare earth containing red emitting phosphors) and unconventional magnetic properties governed by geometric frustrations. Aside from the structural analysis (powder and single-crystal X-ray diffraction, infrared spectroscopy), a variety of characterization methods (photoluminescence spectroscopy and magnetic measurements) were applied to study the material’s properties. Single crystal X-ray studies reveal that 1 (P21/c with a = 5.501(1), b = 14.203(3), c = 16.9...
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