| Summary: | A novel coordination polymer {[Ho<sub>2</sub>(DHTA)<sub>3</sub>(H2O)<sub>5</sub>]·H<sub>2</sub>O}n (<b>1</b>) was synthesized by hydrothermal synthesis (DHTA = 2,5-dihydroxy-1,4-terephthalic acid anion). The crystallographic data show that complex <b>1</b> crystallizes in a triclinic system with space group <i>P</i><inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mover><mn>1</mn><mo>¯</mo></mover></math></inline-formula>, 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, C<sub>24</sub>H<sub>24</sub>O<sub>24</sub>Ho<sub>2</sub>, and M<sub>r</sub> = 1026.290. Complex <b>1</b> 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 (Ho<sub>2</sub>O<sub>3</sub>). The luminescent results reveal that the complex has potential application as a new green luminescence material.
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