Abstract
Coordination polymer formulated as [Ho2(PDA)3(H2O)] n ·2nH2O having three-dimensional network was hydrothermally synthesized (H2PDA is 1,4-phenylenediacetic acid). The polymer crystallizes in the monoclinic space group P 21/c, unit cell parameters: a = 21.7025(2) Ǻ, b = 10.03560(10) Ǻ, c = 14.03430(10) Ǻ, β = 91.7110(10)° (Z = 4), and exhibits a three-dimensional porous framework. The polymer contains two and four crystallographically independent holmium(III) ions and 1,4-phenylenediacetate anions, respectively. The two types of Ho(III) ions adopt an extended zigzag orientation and act as nodes alternately, while three different carboxylate (COO−) groups bridge two adjacent Ho(III) ions. The coordination polymer chains are reinforced by well-directed hydrogen bonds involving guest water molecules. The polymer is mesoporous in nature with average pore size diameter of 5.6 nm. The polymer exhibits intense emission bands in visible region upon excitation at 390 nm. The polymer is thermally robust and undergoes thermal decomposition in well-defined steps.
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