Unanswered questions

Avance III 400 NMR lift unresponsive... emergency air lift activiated

1 0 7k
answers votes views
Hi, I am unable to activate our lift on our avance III 400 NMR from BruKer The message is emergency air lift activated....
Posted: Tamara 1 / Updated: wilsonmv 1 May 27 '13 at 18:53

question about NQR

4 0 5k
answers votes views
Hi.We have a 500MHz BRUKER AVANCE spectrometer.unfortunately its has been quenched.we have 3 probes:5mmQNP , 5mmBBI and ...
Posted: shokoufeh karimnia 1 / Updated: SankarampadiAravamudhan 91 Jun 04 '13 at 04:44

Not possible to modify the wiki?

0 0 1k
answers votes views
Hi. I receive this error, when I try to modify the wiki. Fatal error: Cannot redeclare class MWNamespace in /var/www/nm...
Posted: Troels E. Linnet 1 / Updated: sdriegel 1 Jul 04 '13 at 12:45

csrosetta server application

0 0 1k
answers votes views
I upload my protein on csrosetta server for generating structures. I have provided TALOS data file. Its already two days...
Posted: anup 1 Jun 04 '13 at 06:09

How to start experiment at particular row

1 0 3k
answers votes views
I was running a 3D 15N edit NOESY (on a Bruker 600) and it was inadvertently stopped. I would like to restart the experi...
Posted: Lola Brown 1 / Updated: Pete Gierth 401 Jun 13 '13 at 11:05

ROESY build-up curve - simulation software

0 0 2k
answers votes views
Hello, I have some users interested in measuring a ROESY build-up curve for their samples (NOESY does not work due to m...
Posted: sararah 11 Jun 10 '13 at 08:30

!3C NMR of Peptide

0 0 2k
answers votes views
Hi, thank you for reading my question. I am a novice at NMR, I apologize in advance if my question appears naive. I am ...
Posted: pjb 1 Jun 11 '13 at 00:32

2-Methoxybenzaldehyde

2 0 6k
answers votes views
Hey everyone, I've started practicing reading NMR again after having not done so for years, and I'm getting caught up o...
Posted: John Xavier 1 / Updated: Pete Gierth 401 Jun 17 '13 at 12:06

FMR on EPR

0 0 2k
answers votes views
Hi, I need to run FMR (ferromagnetic resonance) on Bruker x-band CW EPR spectrometer. I know it can be done, but I would...
Posted: nmrman 1 Jun 14 '13 at 07:52

counting unambiguous noe assignments

1 0 3k
answers votes views
Dear everyone, I was wondering how can I know the number of unambiguous noe assignments both after manual assignment an...
Posted: Yar 13 / Updated: eiso 31 Jul 10 '13 at 04:24

How to get off resonance ligand integral in STD experiment

0 0 2k
answers votes views
Hello I am using satxfer1D experiment on varian unity plus 500 MHz spectrometer and vnmr (not vnmrJ!) software. I would...
Posted: Kate 1 Jun 26 '13 at 04:59

The FID in the F1 dimension is not fully sampled – it is cut off.

0 0 5k
answers votes views
HELLO all nmr wikier, I am facing problem in hsqc experiment on bruker machine using pulse prog hsqcetgpsi Normally the ...
Posted: feroon 21 Jun 27 '13 at 10:09

35Cl NMR spectra

3 0 6k
answers votes views
Hi, I am new here! I am working on Bruker 600 MHz over 10 years, but now I have problem to get 35Cl NMR spectrum. I use...
Posted: gugica 1 / Updated: Tony Bielecki 131 Jul 10 '13 at 07:32

Strange peak distortions but that of water

2 0 4k
answers votes views
Hy everyone, I'm having a strange problem when reading the NMR spectrum of a small aromatic molecule in deuterium oxide:...
Updated: Ruggero 3 Jul 15 '13 at 03:22

NMR Vs X ray crystal data not matching each other

2 0 3k
answers votes views
I had a very weird situation where my compound shows double bond between carbons in NMR but shows it as single bond in x...
Posted: shanku 1 / Updated: John Hollerton 96 Dec 09 '13 at 09:57

Processing varian 2D data done with a 3D pulse sequence

2 0 3k
answers votes views
Hello all, I am working with a varian spectrometer and did a 2D experiment with a 3D pulse sequence and I need help with...
Updated: PBjang 1 Jul 17 '13 at 01:39

spinner .... stuck

1 0 13019
answers votes views
Dear Colleagues: I've varian nmr 300, and i've a problem with the spinner that doesn't eject, it stucked like it is froz...
Posted: Eyad omari 1 / Updated: Jerry Hirschinger 199 Jul 22 '13 at 08:35

Reset F1 axis (Bruker)

1 0 3k
answers votes views
Hi all, I have a 2D Bruker dataset that took a while to acquire, so I'd rather not simply repeat it. However, it seems...
Updated: wilsonmv 1 Aug 11 '13 at 22:12

S/N increases then decreases in 2D HMBC-type experiment

2 0 3k
answers votes views
Hello All Does anyone have any ideas on why the S/N would increase and then degrade during an HMBC-style experiment? I...
Posted: Craig 41 / Updated: Scott Robson 156 Aug 02 '13 at 08:42

Help solving a spectrum!

2 0 3k
answers votes views
Can someone please help me solve an nmr problem? I've tried a lot but can't get it. Please post ur email and i'll send y...
Posted: Lyra 1 / Updated: vaclavrimal 11 Aug 08 '13 at 04:44

2D 103Rh frequency wrong

1 0 4k
answers votes views
I have run a 1H-103Rh HMQC on [Rh(acac)(cod)] and found the chemical shift of the 103Rh to be -7023 ppm. The frequency ...
Updated: Linette Bennie 1 Aug 13 '13 at 05:29

Gradient settings in an experiment

2 0 6k
answers votes views
how do we decide on power levels and lengths of purge gradients in a new experiment?...As for coherence selection, relat...
Updated: nmr2rmn 3 Aug 09 '13 at 14:58

proton decoupled of 14N

2 0 5k
answers votes views
Hi everyone, Has someone tried to run proton decoupled of 14N? How long should be the 14N decoupling pulse? I had some ...
Posted: alina 1 / Updated: Tony Bielecki 131 Aug 09 '13 at 05:55

g03defaults in gaussian 09

0 0 2k
answers votes views
Hi, I am using gaussian 09 to simulate proton NMR and I am comparing my results with the ones published here: Atieh, Z...
Posted: LFF 1 Aug 16 '13 at 04:09

simulation software for small molecules, liquids

2 0 4k
answers votes views
Hi all, i'd like to hear some experiences you folks had on this theme. I wanna by a program for that. Just googling for...
Posted: fid 139 / Updated: ehaapani 1 Oct 07 '13 at 01:11

topshim error: wait for event... timeout after 20 sec

2 0 5k
answers votes views
I use a Bruker Avance 400 III, when using topshim command the following error appear: 'wait for event-acquisition runnin...
Posted: smithnany 1 / Updated: ehaapani 1 Oct 07 '13 at 22:13

1D NOESY with selective excitation and water suppression

2 0 10442
answers votes views
Hi, I am trying to collect 1D NOESY spectrum of a small protein in 90% H2O with selective excitation so I could follow ...
Posted: slawojek 1 / Updated: kyleabeauchamp 1 Mar 06 '14 at 15:37

Macro available that can determine the standard deviation of the spectral noise for a many similar 2D spectra

0 0 2k
answers votes views
Hi ! I need a macro that can determine the standard deviation of the spectral noise for a many similar 2D spectra. I h...
Posted: Troels E. Linnet 1 Sep 16 '13 at 05:13

How to recover from quenched or dried magnet?

4 0 21816
answers votes views
We have got a donated AQR/p with Spectrospin 300 magnet and there is no helium inside. It was sitting in the warehouse f...
Posted: agoo 1 / Updated: Jerry Hirschinger 199 Oct 04 '13 at 09:58

Best way to make a 2D figure

2 0 5k
answers votes views
Hi all, I need to make a figure containing a 2D NMR spectrum for a paper. Has anyone figured out a good way to do this...
Posted: wilsonmv 1 / Updated: John Hollerton 96 Dec 09 '13 at 09:44

Selectively coupled 13C NMR

3 0 8k
answers votes views
Is it possible to run a 13C spectra in which one carbon is coupled (with 1H) and remaining carbons are decoupled, using ...
Posted: praveen 1 / Updated: sekhar Talluri 621 Oct 27 '13 at 04:20

problem in opeining processed vnmr file into sparky

1 0 2k
answers votes views
hello everyone I have a problem in opening vnmr file into sparky. i have converted vnmr file into ucsf, when this file ...
Updated: surendra gupta 1 Oct 22 '13 at 00:02

Individually phase pseudo-2d DOSY spectra?

2 0 5k
answers votes views
Hello, I have a DOSY data set in TopSpin and I'd like to extract diffusion coefficients for two small peaks in the spec...
Posted: DBritt 1 / Updated: Ignacio Pérez-Victoria 1 Oct 29 '13 at 01:47

relaxation

2 0 5k
answers votes views
how T1 and T2 relaxation time depend on nmr signal? ...
Posted: shine a 1 / Updated: w101bdk 7 Oct 29 '13 at 07:39

hsqc referencing

2 0 4k
answers votes views
Hi! I need to know how to reference nitrogen 15 from proton in a foldel hsqc experiment...I don't know how to calculate ...
Posted: silvia castro 1 / Updated: sekhar Talluri 621 Nov 01 '13 at 17:46

how to do peak picking manually in VNMRJ

1 0 2k
answers votes views
I known how to pick peaks automatically. But it always omits some small peaks and picks some noise as peaks. Is there an...
Posted: de xiao 11 / Updated: dejian 11 Dec 12 '13 at 08:20

Relative quantification (residual solvents)

2 0 33237
answers votes views
Hi All, I've been trying to get a clear answer to this question for a while now, but can't seem to get a definitive ...
Posted: organicadam 1 / Updated: John Hollerton 96 Dec 09 '13 at 09:37

MAS spin counting

5 0 3k
answers votes views
Hi, We have a Bruker MAS probe (4mm, late 90s vintage, widebore) that reports a spin speed twice what it is actually doi...
Posted: Kate Nairn 11 / Updated: w101bdk 7 Nov 13 '13 at 10:22

Capillary vs bulk solvent chemical shift difference

1 0 7k
answers votes views
I have prepared a sealed DMSO-d6 capillary tube (3mmOD) to use as an internal reference for an undergraduate prac using ...
Posted: Victoria Bitter 11 / Updated: SankarampadiAravamudhan 91 Apr 25 '14 at 16:59

31P signal at negative 74 ppm

2 0 7k
answers votes views
Hello All Does anyone have any ideas on what might give a phosphorus signal at negative 74 ppm (cf phosphoric acid)? T...
Updated: Craig 41 Nov 19 '13 at 05:11

NMR of compounds containing iron

1 0 3k
answers votes views
Are there any problems with doing proton NMR of a compound containing iron? ...
Updated: Debbie 1 Nov 15 '13 at 10:43

How to convert inversion recovery data acquired using Spinsight

0 0 3k
answers votes views
Hi, I do not know how to convert a data set acquired using Spinsight into a format that can be read by Topspin. The d...
Posted: mike 1 Nov 14 '13 at 14:00

why prefer using Nitrogen NMR than carbon and hydrogen NMR

1 0 2k
answers votes views
Hi, I am new in NMR. Can someone please answer me why prefer N-NMR but not C and H -NMR? Thanks ...
Posted: Rimond john 1 / Updated: de xiao 11 Nov 18 '13 at 07:50

how to get a 1H-15N HMBC spectroscopy

4 0 8k
answers votes views
hi All, I run a 1H-15N HMBC experiment on a Bruker AVANCE III 600 MHz spectrometer. But I fail to get the long- range ...
Posted: nmrqibebt 1 / Updated: Kirk Marat 711 Dec 09 '13 at 07:48

Streaks in RDC Gel Spectrum

2 0 8k
answers votes views
Hello all, I have used stretched polyacrylamide gels successfully many times to collect RDC data for proteins. The las...
Updated: ChemMJW 99 Dec 06 '13 at 19:10

How can I tell if and what kind of solvent suppression was used?

2 0 5k
answers votes views
I have some older 2D HSQC 1H-15N data that was run by a NMR tech. Is there a way I can tell what kind of solvent suppre...
Posted: BrianW 1 / Updated: uabnmr1 1 Feb 26 '14 at 07:11

How to exactly set integral start and end in VNMRJ

0 0 1k
answers votes views
One can roughly set the integral start and end by left clicking in the spectra. Is there a command which let you type in...
Posted: de xiao 11 Nov 27 '13 at 07:58

PHIP experiments

0 0 1k
answers votes views
Dear all! I am struggling with some density matrices in PHIP experiments. I understand why the density matrix before hyd...
Posted: Elina Lisitsin 1 Nov 28 '13 at 02:41

"Satellite" peaks in polypeptide HSQC

1 0 3k
answers votes views
In the decoupled HSQC of a polypetide I see two small peaks right and left to the delta arginine signal. These peaks hav...
Posted: PQdotL 21 / Updated: Pete Gierth 401 Nov 29 '13 at 00:45

How to calibrate pulse length for urine samples?

2 0 5k
answers votes views
I recently read an article about executing a WET sequence for water suppression in urine samples. The 90°excitation puls...
Updated: brighman 1 Dec 26 '13 at 18:10
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