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seapink107木蟲 (小有名氣)
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【求助】求助NaHTe的合成 已有1人參與
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Preparation of Sodium Hydrogen Telluride: By a molar ratio of 2:1, sodium borohydride was used to react with tellurium in water to produce sodium hydrogen telluride (NaHTe). Briefly, 60.5mg of sodium borohydride was transferred to a small flask; then 5mL of DI water was added. After 102mg of tellurium powder was added in the flask, the reacting system was cooled by ice. During the reaction, a small outlet connected to the flask was kept open to discharge the pressure from the resulting hydrogen. After approximately 8h, the black tellurium powder disappeared and sodium tetraborate white precipitation appeared on the bottom of the flask instead. 我是照著paper上給出的方法做的。 首先稱取固體NaBH4,放在燒瓶中加水溶解,同時用冰水冷卻燒瓶。 然后稱取Te粉末加入燒瓶。 一直攪拌以及用水冷卻,反應(yīng)時間12小時。 反應(yīng)結(jié)束后,仍然有很多黑色粉末存在,還有一些看上去好像發(fā)亮的粉末狀產(chǎn)物。 我移取了透明的溶液,一部分立即用于反應(yīng)。 另一部分放置在小瓶中,3小時后黑色粉末析出。 希望做過這個實驗的同志能幫我解答一下,為什么還有那么多黑色粉末,文獻里面說的白色沉淀是指純白色還是什么,我貌似沒有看到。 再有就是3小時后析出的黑色粉末是Te嗎,這個意味著反應(yīng)成功還是失敗? 請有經(jīng)驗的同志幫忙,謝謝了 追加問一句, 因為文章里沒有提及反應(yīng)環(huán)境,只說要留小口排氫氣, 想知道這個反應(yīng)要在Ar gas的環(huán)境下進行嗎? [ Last edited by seapink107 on 2010-8-23 at 13:59 ] |
木蟲 (小有名氣)
銀蟲 (小有名氣)

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