Supramolecular open-framework based on 1-D iron phosphate-diphosphate chains assembled through hydrogen bonding

Fe(H2PO4)(H2P2O7).C5H5N, a new iron(III) phosphate with an open-framework has been synthesized hydrothermally using pyridine as organic template. The crystal structure was solved ab initio using conventional powder X-ray diffraction data. The unit cell is orthorhombic, a=9.5075(2), b=10.1079(1), c=13.3195(2) A, space group P212121, Z=4. The structure consists of FeO6 octahedra joined by H2PO4 and H2P2O7 groups forming linear chains interconnected by hydrogen bonding to give rise to a supramolecular framework enclosing tunnels in which the pyridine molecules reside. - Graphical abstract: The low temperature hydrothermal synthesis offers many possibilities in the preparation of new materials with mixed octahedral-tetrahedral open-frameworks. Fe(H2PO4)(H2P2O7).C5H5N is constituted by linear chains of FeO6 octahedra joined through of both dihydrogenphosphate and dihydrogendiphosphate bridges, interconnected by hydrogen bonds, originating channels where the pyridine molecules are located