【摘 要】
：
Two novel zeotype crystals, K4[Cr3O(H2O)3(OOCH)6]2[P2W18O62]·9.5H2O(1) and K4 [Cr3O(H2O)3·X-ray single crystal diffraction. Crystal data: C12H43O103.5K4Cr6P2W
【机 构】
：
Institute of Chemistry for Functionalized Materials,Liaoning Key Laboratory of Bio-organic Chemistry
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Two novel zeotype crystals, K4[Cr3O(H2O)3(OOCH)6]2[P2W18O62]·9.5H2O(1) and K4 [Cr3O(H2O)3·X-ray single crystal diffraction. Crystal data: C12H43O103.5K4Cr6P2W18(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; C6H57O98K4Cr3CoP2W17(2), hexagonal P6(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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