Synthesis, structure and magnetic characterisation of a new layered ammonium manganese(ii) diphosphate hydrate, (NH4)2[Mn3(P2O7)2(H2O)2]Electronic supplementary information (ESI) available: powder XRD data, atomic coordinates and thermal parameters, IR data, bond valence calculations, TGA. See http://www.rsc.org/suppdata/jm/b3/b304003h/
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