Tagged questions

Does anyone know something about paramagnetic relaxation enhancement (PRE)?

5 1 26573
answers votes views
Does anyone know something about paramagnetic relaxation enhancement (PRE)? i would like to try this method on my cellul...
Posted: Nico T 33 / Updated: Bharathwaj 112 Oct 19 '10 at 08:48

Chemical Potential By NMR

3 2 4k
answers votes views
New to NMR, but a coworker mentioned that it may be possible to obtain chemical potential for a solution (polymer in sol...
Posted: jclark419 21 / Updated: SankarampadiAravamudhan 91 Oct 13 '10 at 19:50

Absence of some signals on 1H and 13C spectra of polyaromatic carboximidate

3 0 4k
answers votes views
Hi, I have encountered a strange behaviour of some signals (they are absent) in a series of polycyclic aromatic carboxi...
Posted: Arkadiusz Leniak 238 / Updated: zablociak 21 Mar 23 '15 at 12:11

About paragnetic impurities, inorganic salts, bad workups, etc. and their impact on small-molecule NMR spectra

2 1 16572
answers votes views
I sometimes face the challenge of explaining to my organic chemists that, even if no impurity signals are visible in the...
Posted: Sylvain Demanze 71 / Updated: djh 1 Aug 11 '11 at 03:19

Can correct TAUc be a sufficient evidence of the absence of aggregation?

2 0 4k
answers votes views
Hello! I am studying the protein backbone dynamics using the standard set of NMR relaxation parameters (R1, R2, NOE). ...
Posted: Andrey 1 / Updated: Yoan Monneau 136 Jul 01 '11 at 03:52

13C quaternary centers in amino acids

2 0 3k
answers votes views
I've got a sample of about 5mg of an amino acid that is the final product of a a synthesis. Due to the long relaxation t...
Posted: Eneas 1 / Updated: Matthew Revington 41 Sep 06 '11 at 09:04

T1 Rho relaxation

2 0 6k
answers votes views
I am looking for some guidance on researching T1rho relaxation. Does anybody have updated information or references to e...
Posted: Robert Bussell 1 / Updated: Alexey Potapov 21 Oct 15 '11 at 04:56

Relaxation editing vr paramagnetic relaxation enhancement experiments - 13C CP-MAS NMR

1 1 5k
answers votes views
I am a beginner in NMR spectroscopy and I would like to learn more about relaxation editing experiments vs PRE. A collea...
Posted: Nico T 33 / Updated: bmoret42 11 Jan 25 '11 at 12:29

Best Relaxation delay 3D NMR

1 1 4k
answers votes views
Dear NMR WIKIers I prefer to measure best relaxation delay for 3D nmr experments by giving array ( like 0.5 , 0.6 , 0....
Updated: sri 71 May 24 '11 at 02:44

1H t2 measurement in solid state nmr

1 0 3k
answers votes views
How to measure t2 of 1H in solid state nmr? we use saturation burst followed by cp to measure T1 of 1H in solid state in...
Posted: vgk 1 / Updated: Ulrich Haunz 210 Mar 05 '12 at 03:34

Relaxation time of adenine H2

1 0 1k
answers votes views
Could anyone tell the reason why adenine h2 has a longer T1 and T2 than the other prontons in nucleic acid? It would be ...
Updated: yuan 1 Jan 13 '13 at 22:36

T2 relaxation (CPMG) measurement of 13C high resolution spectra

1 0 6k
answers votes views
Hi all, my question is how to perform a T2 measurement of 13C liquid NMR spectra in BRUKER AVIII ? What sequence to use?...
Updated: TiagoB 5 Feb 19 '14 at 04:23

Choice of relaxation delay time (d1) in 2D experiments.

1 0 2k
answers votes views
Hi, Most people tend to use a lower d1 for 2D than for 1D. Help me understand why. Furthermore, supposing you know you...
Updated: gravatar 83 Mar 09 '15 at 02:21

Measuring T1 for a low concentration (1mM) compound in water.

1 0 4k
answers votes views
Hi, I'm trying to measure T1 for a compund at 1mM in water using t1ir. Seeing how my concentration is so low, phasing m...
Posted: gravatar 83 / Updated: Ulrich Haunz 210 Oct 23 '14 at 08:39

Relaxation rate of bulk (pure) water at high frequencies

1 0 1k
answers votes views
Hi all, Does anyone know if NMR relaxation rates of bulk (pure) water has been measured experimentally at several hundr...
Posted: Gyro 1 / Updated: Jerry Hirschinger 199 Jul 21 '16 at 05:08

How to study polymer degradation by gamma and X-Ray radiation?

0 1 3k
answers votes views
Hi, I was asked to study polyethylene degradated by gamma and Xrays. I planed to measure relaxations rates, but which on...
Posted: Anne Baudouin 36 / Updated: Evgeny Fadeev 5771 Mar 16 '11 at 08:10

How to edit format of Variables in NMRPipe?

0 0 744
answers votes views
Dear all, I would like to change the number of decimal place for the X and Y ppm values in nmrdraw (peak detection). The...
Posted: Jerry J 1 Aug 18 '15 at 14:37

Why is the T1 relaxation time of protons shorter than for other nuclei?

0 0 4k
answers votes views
So I think this could be asked in my oral exam. Why are the T1 relaxation times in NMR spectroscopy shorter than those o...
Posted: NMR Dummy 1 Jan 25 '17 at 09:56
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