16 Questions 36 Answers 0 Followers
Questions related from Salem Baroudi
Dear Community, I would like to develop and validate a qualitative NMR method for the analysis of a specific category of chemicals, and my question is the following: What are the criteria that I...
09 July 2024 1,235 4 View
Hello, I am trying to figure out the structure of an unknown compound that contains fluorine atoms with NMR, and for the moment I have done the Fluorine (coupled) experiment. As I have a BBO...
13 May 2023 1,620 4 View
Dear community, I am currently running some solvent suppression experiment on water samples. I first run a one scan 1H experiment to get the ''O1P'' and then implement it in the solvent...
20 April 2023 9,696 6 View
Hello, I have a Bruker spectrometer with TopSpin 4.1.1 and I would like to know how to perform an external referencing of an already acquired 31P{1H} spectrum (locked and shimmed) using 85%...
08 April 2022 9,942 12 View
I am conducting long NMR experiments at 30°C on samples that contain some volatile compounds and chloroform-d as lock solvent. In order to avoid the loss of the analytes and the solvent, I would...
07 March 2022 6,700 12 View
Hello, I have samples that contain analytes with relatively low concentration (in the order of tens of ppm) in various solvents (aqueous and organic solvents). As the 1H NMR solvents signals are...
21 December 2021 7,440 3 View
Hello, Solvent suppression or in general selective suppression of NMR signals is well established and known in 1D 1H experiments. But how to perform multiple signal suppression (more than one...
21 December 2021 3,150 6 View
Hello community, I would like to have an efficient drying protocol of deuterated NMR solvents. Which drying agent to use ? How much do I have to use ? Do I have to wait for a certain time (24h or...
08 November 2021 673 7 View
When trying to identify an organophosphorus compound, one of the ways to proceed is to compare the phosphorus chemical shift of the compound of interest with those of a standard. However, this...
25 July 2021 7,853 4 View
Hello, I want to assess the purity of synthesized chemicals using relative quantification. The 1H signals of the analyte (synthesized chemical) and those of the impurities are known and...
29 April 2021 1,914 2 View
Hello, I have a sample that contains a certain number of organophosphorus compounds, each one of them has an alkyl (P-R bond) or alkoxy side chain (P-OR bond). I would like to perform a rapid...
27 April 2021 5,808 10 View
Hello, I am trying to identify the formation of a synthesis product. Knowing the precursors, I focused on the identification of the H-C long-range coupling between sites (a/b) and (a/c) using...
20 January 2021 8,570 5 View
I would like to develop and validate NMR methods that I would use in the identification of certain chemicals (mainly organophosphorus compounds, amino alcohols, and other fluorinated compounds)...
25 December 2020 7,820 5 View
I have acquired a [1H-13C]-HSQC spectrum of a sample containing D2O as a solvent, and when I type ''xfb'' to process the FID and see the result I have an abnormal result (See joint picture). as...
19 December 2020 8,736 3 View
I would like to conduct a [1H-13C]- HSQC (optimized for one bond H-C connection) experiment. What would be the best default topspin pulse program and parameters set to use ? Thank you.
15 December 2020 7,082 5 View
Hello, I'am trying to run the 1H NMR spectrum of an ionic solution (Bromide Salt). the solution is too viscous so I had to randomly add a certain volume of deuterated chloroform, and then...
01 December 2020 8,931 1 View
