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kfwangguan木蟲 (小有名氣)
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[交流]
【請教】請教一下這個生長晶體的奇怪方法到底是什么?謝謝 已有2人參與
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我們都知道一般晶體的生長方法有諸如 solvent evaporation,solution diffusion,hydrothermal conditions 等等,但是我看的這個文獻(xiàn)上面說的合成方法里有rotorary evaporator 還有 centrifugation 什么的,里面加入有機(jī)溶劑分離沉淀的步驟又像是 decantation . 最后長出晶體那一步說的也不詳細(xì) 不知道什么長出來的。如果歸納他的合成方法是不是應(yīng)該叫做solvent evaporation 呢?如果不是那應(yīng)該叫做什么? 謝謝大家 幫忙分析一下最后長出晶體用的是什么方法? A mixture of a and b in 9 mL of water was refluxed for 45 min, after which the volume of the solution was reduced to half on a rotorary evaporator. Addition of 5 mL of ethanol to the solution led to the formation of an orange precipitate of c, which was separated by filtration. Addition of a few drops of ethanol to the filtrate led to the formation of a fine yellow-orange powder, which was identified as a mixture of compounds and was separated after centrifugation. In the resulting solution, pale-yellow needle crystals of d appeared in a few hours. [ Last edited by kfwangguan on 2010-8-24 at 13:14 ] |
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rotorary evaporator 應(yīng)該是旋轉(zhuǎn)蒸發(fā)儀,主要用于在減壓條件下連續(xù)蒸餾大量易揮發(fā)性溶劑。對萃取液的濃縮和色譜分離時的接收液的蒸餾,可以分離和純化反應(yīng)產(chǎn)物。 centrifugation應(yīng)該是用離心機(jī)分離吧,在做水溶液時用到過,當(dāng)時是為了分離溶液中的沉淀,調(diào)節(jié)溶質(zhì)的PH值,觀察生長變化,這篇文獻(xiàn)里可能只是分離。 |
捐助貴賓 (著名寫手)

木蟲 (小有名氣)
木蟲 (正式寫手)
小木蟲之小藥蟲

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