22 Questions 19 Answers 0 Followers
Questions related from Jubyeong Chae
Hi, I studied metal complex and the binding site using 1H NMR and ESI-mass. First of all, the ESI-mass result was [L-H+ + M2+]+. One proton was removed in this result. However, I couldn't get...
19 December 2018 1,667 4 View
Hi, I usually check 1H NMR titration for studying binding mode between ligand and metal ion. Most papers interpret the peak movements as binding with meatl ion. Then, what is the resonable...
13 December 2018 1,472 4 View
Hi, I'm wondering why paramagnetic ions effect relaxation time in NMR. To be specific, why paramagnetic ions makes relaxation time faster? I understood the small magne (paramagnetic ion)...
07 December 2018 9,053 3 View
Hi, When we want to present the result of proton NMR, doublet peaks could be explained by using J coupling. However, the triplet is affected near protons. Therefore, the splitting is different...
19 September 2018 1,229 7 View
Hi, In order to synthesis some compound, I mixed starting materials and checked each compound in the TLC plate. However, one of starting material showed two spot. So, I took a proton NMR for...
09 August 2018 8,111 8 View
Hi, I'm searching papers which the ratio between ligand and metal is becoming different as changing metal equivalent. For example, in low concentration of metal ion, ligand and metal bind 2 to...
26 March 2018 8,810 2 View
Hi, I synthesized the molecule below, and checked proton NMR the integral value is almost same and peak However, I can't assign some peaks. I attatched pictures of NMR I don't know whether...
15 March 2018 4,240 4 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...
07 March 2018 6,521 3 View
Hello guys, I have a question for ICT mechanism and fluorescence turn on. If one molecule showed ICT process from electron donor group to electron acceptor group, why the fluorescence can be...
07 March 2018 6,856 1 View
Hi guys, I learned that dmso peak in 1H NMR caused by proton exchange. So the peak at 2.5 ppm indicates dmso-d5 not d6 Also the dmso which have more exchanged proton like d4 or others can be shown...
05 March 2018 9,269 3 View
Dear all, In order to study proton NMR, I synthesized salen structure which have several donating and withdrawing group as shown in picture. I understood that most protons are shielded as...
12 February 2018 3,230 6 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...
11 February 2018 5,711 3 View
Hi, I've been calculated several metal-ligand complex to prove binding mechanism such as Cu, Zn. In these calculations, I conducted using B3LYP/GEN basis set. However, in the case of...
05 February 2018 5,848 5 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...
21 January 2018 7,236 12 View
Hi I synthesized something that looked like pale yellow oil. In order to separate it from starting material, I did column chromatography. As product loaded, the pale yellow color is dilluted...
20 January 2018 3,241 8 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...
11 January 2018 7,250 0 View
Hi, As you can see that picture(https://www.masterorganicchemistry.com/2017/09/19/hofmann-and-curtius-rearrangements/), this nucleophilic addition reaction only forms C-N single bond I think the...
10 January 2018 3,995 4 View
Hi, I synthesized this structure which is combind with pyridine diamine and chloro acetylchloride. Then, I have a question about the imidazole proton. The proton could be shifted or not? If so,...
03 January 2018 1,395 4 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...
19 October 2017 6,196 3 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...
03 October 2017 9,528 6 View
Hi, I want to synthesis anymetric imine. For example, One moiety which has diamine group and two different aldehyde react with diamine. I tried serveral times but when one aldehyde react and try...
09 February 2017 4,786 5 View
Hi, I checked some IR spectrum metal complex which I synthesized. It is different from starting ligand but I'm wondering the complexation could affect transmittance. I think the rigid structure...
01 January 1970 3,499 5 View
