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首页> 中文期刊> 《高等学校化学研究（英文版）》 >Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4Cr3O(H2O)3(OOCH)62P2W18O62 ·9.5H2O and K4Cr3O(H2O)3(OOCH)6H3P2W17Co(H2O)O61·20H2O

Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4Cr3O(H2O)3(OOCH)62P2W18O62 ·9.5H2O and K4Cr3O(H2O)3(OOCH)6H3P2W17Co(H2O)O61·20H2O

         
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Two novel zeotype crystals, K4[Cr3O（H2O）3（OOCH）6]2[P2W 18 O 62 ]·9.5H2O（1） and K4[Cr3O（H2O）3·（OOCH）6][H3P2W 17 Co（H2O）O 61 ]·20H2O（2）, were synthesized and their structures were determined using X-ray single crystal diffraction. Crystal data: C 12 H 43 O 103.5 K4Cr6P2W 18 （1）, hexagonal P6（3）/m, a =1.5895（2） nm, b=1.5895（2） nm, c=2.1620（4） nm, α=90°, β=90°, γ=120°, V=4.7305（13） nm3, Z=2, R1=0.0726, wR2=0.1542; C6H 57 O 98 K4Cr3CoP2W 17 （2）, hexagonal %P%6（3）/mmc, a = 1.61328（3） nm, b=1.61328（3） nm, c=2.06613（9） nm, α=90°, β=90°, γ=120°, V=4.6570（2） nm3, Z=2, R1=0.0377, wR2=0.1070. These crystals were characterized using elemental analysis, IR, TG-DTA, and XRD. It was found that the polyoxometalate anions maintained Wells-Dawson structure for crystal 1 and lacunary Wells-Dawson structure for crystal 2. Thermal analysis showed that crystal 1 lost the water of crystallization at 132 ℃, whereas crystal 2 lost the water of crystallization at 100 ℃. Crystal 1 could reversibly desorb and adsorb water molecules and its crystal structure could be restored after re-adsorbing the water molecules. It was also found from the XRD patterns that the void size of crystal 2 is smaller compared with that of crystal 1, which is attributed to the higher anion charges.

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