Solvothermal Synthesis and Structure of Ni(HP2O7)F·C2N2H10, a New Fluorinated Nickel Phosphate with a Chain Structure

A new one-dimensional fluorinated nickel phosphate Ni (HP2O7)F·C2N2H10 has been synthesized solvothermally using ethylenediamine as the template and its structure was determined by means of single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic system, space group C/2c (No. 15) with M=314.78, a=12.658(3) Å, b=14.502 (3) Å, c=10.820(3) Å, β=109.924(5)°, V=1867.3(8) Å3, Z=8, R=0.0318, and wR=0.0670. The structure consists of infinite chains of cis, trans-corner-sharing NiO4F2 octahedra with the adjacent octahedra being bridged by HP2O7 groups, which are H-bonded with amine groups of the organic cations. The Ni–F bond lengths along the backbone of the chain are alternately short and long. The as-synthesized product is characterized by powder X-ray diffraction, IR spectroscopy, inductive couple plasma analysis, thermogravimetric analysis, and differential thermal analysis.