Jubyeong Chae

13 Questions 13 Answers 0 Followers

Questions related from Jubyeong Chae

How to interpret the difference between ESI-mass and 1H NMR results?

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 1,620 4 View

What is the resonable interpretation of NMR titration with metal?

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 1,434 4 View

How paramagnetic ions effect relaxation time in NMR?

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 9,018 3 View

How to explain J coupling of triplet in the paper?

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 1,186 7 View

How can I increase the yield of this compound?

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 6,462 3 View

Why does DMSO show quintet in 1H NMR?

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 9,126 3 View

Why brine(saturated NaCl solution) is better than water in extratction?

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 5,639 3 View

What basis set is efficient for Iron complex in DFT calculation?

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 5,808 5 View

How to use F254 silica gel for column chromatography?

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 7,190 12 View

How can I separate transparent product using column chromatography?

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 3,198 8 View

Phosphoric acid could be used to wash filter glass?

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 6,159 3 View

How this proton NMR could be explained?

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 9,489 6 View

Does the transmittance in IR spectrum decrease by forming metal complex?

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 3,459 5 View