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ÎÒÃǶ¼ÖªµÀÒ»°ã¾§ÌåµÄÉú³¤·½·¨ÓÐÖîÈç solvent evaporation£¬solution diffusion£¬hydrothermal conditions µÈµÈ£¬µ«ÊÇÎÒ¿´µÄÕâ¸öÎÄÏ×ÉÏÃæËµµÄºÏ³É·½·¨ÀïÓÐrotorary evaporator »¹ÓÐ centrifugation ʲôµÄ£¬ÀïÃæ¼ÓÈëÓлúÈܼÁ·ÖÀë³ÁµíµÄ²½ÖèÓÖÏñÊÇ decantation . ×îºó³¤³ö¾§ÌåÄÇÒ»²½ËµµÄÒ²²»Ïêϸ ²»ÖªµÀʲô³¤³öÀ´µÄ¡£Èç¹û¹éÄÉËûµÄºÏ³É·½·¨ÊDz»ÊÇÓ¦¸Ã½Ð×ösolvent evaporation ÄØ£¿Èç¹û²»ÊÇÄÇÓ¦¸Ã½Ð×öʲô£¿ лл´ó¼Ò °ïæ·ÖÎöÒ»ÏÂ×îºó³¤³ö¾§ÌåÓõÄÊÇʲô·½·¨£¿ 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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kfwangguan(½ð±Ò+1):лл 2010-08-24 18:39:51
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just the most traditional way to evapourize solvent and add a poor solvent |
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