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 Post subject: Re: Нуждаюсь в совете
PostPosted: 10 Sep 2022 12:01 
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yes, i think so, thank you! also bismuth complex started decomposition, unfortunately.


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 10 Sep 2022 22:22 
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why one hour of stirring is necessary?


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 11 Sep 2022 09:32 
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Probably, the slow addition of Na2S2O8 is needed.

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 11 Sep 2022 11:59 
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yes maybe, I added it in portions but nothing happened, then I add exec persulfate, and left it a night but still a clear green solution.


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 11 Sep 2022 12:50 
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Persulfate may decompose during storage

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 11 Sep 2022 13:15 
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yes, you are right, but I made Cu(III) with the same persulfate month ago, I post it here as I remember this periodate complex.

ill try this reaction at second time when i go to lab.


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 Post subject: как получить гладкий шар из клея.
PostPosted: 12 Sep 2022 16:08 
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Подскажите, если в сферу(форма) диаметром 3мм через отверстие менее 1мм залить цианакрилатный клей, и таким же способом сразу после заполнения добавить в него активатор, произойдёт ли полная полимиризация? Цель: на выходе получить гладкий глянцевый шар. Хочу понять возможна ли полимеризация в практически герметичной сфере где отсутствует воздух и влажность, только с помощью активатора?
Спасибо всем кто откликнется и подскажет!


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 05:25 
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Расчётное время полимеризации? Мож, сначала смешать и готовую смесь ввести шприцем?
Я думаю, шары делают механическим способом.

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 09:55 
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А чего бы не попробовать? Расходы материалов и времени невелики..


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 13:49 
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Hello, I had a jar of 3,3'-Diaminobenzidine, when I opened it it had black color and ammonia smell, what is the easiest way to make some pure 3,3'-Diaminobenzidine? just the reagent every photo which I saw on the internet had no black color. also, reagent is not soviet made, it's a fluka chemika reagent maybe 10-15 years old.


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 14:25 
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Benzidine and its derivatives are easily oxidized in air. The process is irreversible. I think, that in addition to oxidation, condensation reactions take place.

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 14:46 
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thank you! I opened it months ago. so I hope only a small amount is oxidized. so I thought if I recrystallized or something, I want to make an organic product(on photo) from this compound and 1,10-phenanthroline-5,6-dione, and finally, I want binuclear ligand, then ill make europium complex. finally molecular will be like that two europium metals, one this compound and six any acetylacetone derivative.

the ligand which i made in program:


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 15:40 
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Theoretically, recrystallization is possible. But I have not heard that oxidized benzidine being purified in this way. Amino derivatives are oxidized even more easily than benzidine itself.

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 15:44 
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thanks! anyway ill try with it so let's see the result.


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 16:09 
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Such compounds are toxic (carcinogens). Be careful!

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 Post subject: Re: Нуждаюсь в совете
PostPosted: 13 Sep 2022 17:02 
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yes, sure! thank you!


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 15 Sep 2022 17:56 
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moonshine43 wrote:
А чего бы не попробовать? Расходы материалов и времени невелики..

Спасибо за ответ! Буду пробовать)


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 13:22 
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what is the best way to make uranyl nitrate from metallic uranium? I just want a few ml of its solution to make heteropolymetalate, I don't want it as solid salt.


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 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 13:41 
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The compound is synthesized from UO3 and dilute HNO3. Metallic uranium is a less available raw material, but it can also be used.
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 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 13:49 
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thank you! I saw the oxide method, but I don't have it. I think nitric acid cant oxidize uranium to (VI), maybe it will produce uranium(IV). I can oxidize (IV) to (VI) with H2O2, but I don't know which tetravalent compound will form. there is no uranium nitrate yes? only uranyl nitrate. maybe it produces UO2?


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