Synthesis, Structure, Photoluminescence and Thermal Expansion of a Rare Earth Formate Oxalate Framework 后印本

摘要: A new lanthanide formate oxalate framework [Eu(C2O4)(HCOO)]n (1) has been synthesized via hydrothermal method and characterized by single-crystal X-ray diffraction (SC-XRD). The framework crystallizes in the orthorhombic Pnma space group, with a = 7.0984(4), b = 6.6442(3), c = 10.6793(6) Å, V = 503.68(4) Å3, Z = 3, C3HO6Eu, Mr = 285.00 g/mol, Dc = 3.7581 g/cm3, F(000) = 520.3796, μ = 12.413 mm-1, the final R = 0.0264 and wR = 0.0628 for 797 observed reflections with I > 2σ(I). The photoluminescence (PL) measurements reveal the significant red emission of the framework is dominated by the (5D0 → 7F2) electronic transition at 614 nm. Further variable-temperature powder X-ray diffraction (VT-PXRD) indicates that framework 1 shows slight negative thermal expansion (NTE) along the a-axis, and positive thermal expansion (PTE) along the b and c axes.