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【答案】应助回帖
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The synthesis of hexagonal geometry based MOF-177 (Fig. 1) involves the mixing of bromothymol blue (BTB) (0.07 gm) and salt Zinc Nitrate Hexahydrate (Zn-(NO3)2·6H2O) (0.32 gm) was dissolved in a mixture of organic solvents N,N-diethylformamide (DEF) (20 mL). The mixture was subjected to degassing three times using freeze-pump-thaw method and then stored in a reaction vial (20 mL) with filled and closed tightly. The reaction vial was placed in an oven for 7 days to maintain temperature at 67 °C. after 7 days, clear and transparent MOF-177 and can be seen at the bottom of the reaction vial. The reaction vial is than removed from the oven, decanted and washed with organic solvent N,N-diethylformamide (DEF) to remove the unreacted salt zinc nitrate hexahydrate (Zn-(NO3)2·6H2O). after this step, the reaction vial was filled with chloroform, closed tightly and put in an oven at 70 °C for another three days, and it was replenished with fresh chloroform every day. Because the MOF-177 crystals are vulnerable to moisture and air [22], they were stored and transported in a Schlenk flask under vacuum or in a vial filled with chloroform. |
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