A new intersecting tunnel structure in the AIMIII[PO3(OH)]2 series for AI = Ag, MIII = In: Analysis of structural relationships

A new indium hydroxyphosphate containing silver, AgIn[PO3(OH)]2, has been synthesized using hydrothermal method. It crystallizes in the P21/c space group with the cell parameters a = 6.6400(2) Å, b = 14.6269(6) Å, c = 6.6616(4) Å, β = 95.681(5)°, V = 643.82(6) Å3, Z = 4. Its three-dimensional framework, built up of corner-sharing PO3(OH) tetrahedra and InO6 octahedra, presents intersecting tunnels running along <111> and [100] directions, in which the Ag+ cations are located. The presence of hydroxyl groups has been confirmed from IR spectroscopy studies and hydrogen atoms were located from the single crystal X-ray diffraction study. The structural relationships with the other compounds of general formula AIMIII[PO3(OH)]2 are analyzed.

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