22 Questions 11 Answers 0 Followers
Questions related from Jubyeong Chae
Hi, I have a question about the reaction between julolidine moiety and hypochlorite (ClO-). Please see below the scheme. The color change is very interesting. It changes from yellow to purple...
02 February 2020 6,492 1 View
Hi, I want to interpret the mechanism of blue shift emission. I carried out some experiments about metal detection. The ligand showed green fluorescence and if the metal bound to the ligand,...
11 November 2018 7,945 4 View
http://www.orgsyn.org/demo.aspx?prep=cv6p0276 Hi, I synthesized peroxyacid according to above link. Also I checked that it was successfully synthesized. However, I've wondered why those reagents...
11 November 2018 4,952 0 View
Hi, I'm wondering how broad the allowable range in mass spectrum and reason. (the gap between calculated exact mass and experimental data) I've known that the error range is 1 because of one...
08 August 2018 3,244 3 View
Hi, I want to calculate association constant through following method Talanta Volume 41, Issue 4, April 1994, Pages 599-609 However, I don't understand why I-I0 could be used. Could anyone...
07 July 2018 3,306 0 View
Hi, I should prepare cobalt complex experiment using MIMT (2-mercapto-1-methylimidazole). In this experiment, the coordination numbers were changed depending on what solvent we use. In case of...
05 May 2018 8,613 2 View
Hi, I want to synthesis some compound and found references of them. However, I don't know what 'washing with NaHCO3 solution' means. (Please look at the picture) What is different from...
05 May 2018 8,873 9 View
Hi, I want to know why nitro group and also sulfonate group have poor solubility in water and other polar solvents(DMSO, DMF, MeOH, etc.). Actually I thought the reason is polarity but it...
04 April 2018 9,841 1 View
Hi, When I read this paper, I wonder how to separate organic layer with miscible solvent. (Bull. Chem. Soc. Jpn., 53, 1181-1182 (1980)) The ethylene glycol is miscible with HBr or sth. So it is...
04 April 2018 3,398 0 View
Hi, I want to understand fully about ICT mechanism (intramolecular charge transfer) If the ligand having fluorophore doesn't have fluorescence and act as an electron acceptor (EWG), doest the...
04 April 2018 2,246 3 View
Hi guys, I want to synthesize the compound in the below picture. (Ref from Chem. Commun., 2017,53, 3189-3192 ) Its synthetic procedure seems gabriel synthesis using...
03 March 2018 2,158 3 View
Hi, When I test my ligand in various pH range using britton robinson buffer and DMF mixture, the precipitation was formed between pH 8~12. I don't know why this solvent mixture make...
02 February 2018 4,833 5 View
Hi, I've learned extraction using brine. The reason that I learned was increasing polarity and removing water in organic phase. Then, how this can happen and why brine is better than pure...
02 February 2018 4,897 3 View
Hi, happy new year! I have a question about fluorescnece intensity. It is important to determine optimal excitation wavelength for fluorescenece analysis. However, I don't know why wavelength...
01 January 2018 9,991 3 View
I learned that the reason that hydroxyl proton is not affected by adjacent proton is the rate of proton exchange. Then, why the rate of hydroxyl group proton exchange is faster than -CH? because...
01 January 2018 6,360 0 View
Hi, I want to calculate quantum yield(QY) indirectly by using quinine but some things confuse me. In the relative QY reference, quinine is diluted 0.1M H2SO4 and other concentration is not...
01 January 2018 2,597 0 View
Dear all, Hi, I have a question of F254 silica gel. Using 254 light, the TLC plate emit green fluorescence(?), but when I did column chromatography with F254 silica gel, I couldn't see that...
01 January 2018 2,532 11 View
Dear all, I learned that hydrogen gas was generated from imine reduction using NaBH4, sodium borohydride. However, when I check the mechanism of that, hydrogen gas was not generated. Then, what...
01 January 2018 3,975 3 View
Hi, When we use silicon oil for oil bath and contaminated, how to dispose this oil? Is it ok to dispose with other organic waste? Thanks!
01 January 2018 8,181 4 View
Hi I wanted to learn proton NMR shift by substitution group. As you can see this picture, the main structure is like that The first one is substituted methyl group(C1 proton) and the second one...
10 October 2017 2,110 6 View
Hi, I usually use nitric acid as a washing filter glass. Sometimes mix with ethanol. I found some acid like hydrochloric acid and phosphoric acid. So here is the question. Does acid like...
10 October 2017 7,411 1 View
Hi, I want to purchase MeOH NMR solvent. When I find this, I realize CD3OH and CD3OD is exist. Also CD3OH is more expensive than CD3OD. What is difference between them? is there any good result...
07 July 2017 6,450 2 View
