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Abstract
A novel coordination polymer {[Ho2(DHTA)3(H2O)5]·H2O}n (1) was synthesized by hydrothermal synthesis (DHTA = 2,5-dihydroxy-1,4-terephthalic acid anion). The crystallographic data show that complex 1 crystallizes in a triclinic system with space group P1¯, with a = 9.6617(17) Å, b = 11.902(2) Å, c = 13.284(2) Å, α = 100.617(3)°, β = 92.765(2)°, γ = 106.715(2)°, V = 1429.6(4) Å3, Z = 2, C24H24O24Ho2, and Mr = 1026.290. Complex 1 contains two eight-coordinated metal centers Ho(III). The TGA results show that the weight loss can be ascribed to the removal of the organic component from 400 to 650 °C. At the temperature above 650 °C, the residue is Holmium(III) oxide (Ho2O3). The luminescent results reveal that the complex has potential application as a new green luminescence material.
Highlights
The Ho1 is bound to eight oxygen atoms, five of which are from four different DHTA ligands and the other three are from three aqua ligands, forming a slightly distorted square antiprism (Figure 2)
Three-dimensional coordination polymer comcomposed of DHTA and coordination water molecules
One DHTA ligand posed of DHTA and coordination water molecules
Summary
Metal-organic frameworks (MOFs) are organic–inorganic hybrid materials which are composed of inorganic nodes connected by organic ligands through the self-assembly process [1]. MOFs have shown their applications in the luminescence area over the past decades; many strategies have been proposed to enhance the luminescence properties of the MOFs and have obtained some advanced material to detect heavy-metal ions and organic pollutants [4,5]. Zhao et al have used a solvothermal synthesized Cu3 (BTC) (HKUST-1) to adsorb Ce3+ from water. These results demonstrated a significantly intensive adsorption capacity and a rapid removal rate [6].
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