Tagged questions

method validation in nmr

1 0 1k
answers votes views
please tell me whether there are method validation in nmr ...
Posted: harish ravuri 1 / Updated: Ulrich Haunz 210 May 04 '16 at 01:31

1H 1D NMR data Normalization in Topspin.

1 0 1k
answers votes views
I have performed a series of 1H 1D experiments with different concentration of peptide and accordingly different numbers...
Posted: RBT 1 / Updated: Pete Gierth 401 Nov 23 '15 at 11:14

How to edit format of Variables in NMRPipe?

0 0 725
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

How to calcualte eoors in ppm from Hz of Hsqc data?

1 0 1k
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Hi all, I want to calculate error in ppm from my Hsqc data. My spectrometer yields X1axis, Y1Axis, DX1, DY1, X1ppm, and ...
Posted: ick lad 1 / Updated: Arkadiusz Leniak 238 Mar 17 '15 at 02:10

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

WaterLOGSY pulse program for bruker

1 0 3k
answers votes views
Hello, I was wondering if there was a waterLOGSY sequence among the bruker sequences. If not, could someone tell me whe...
Posted: gravatar 83 / Updated: Arkadiusz Leniak 238 Mar 17 '15 at 08:09

OH, NH, SH Labile protons in water nmr

1 0 2k
answers votes views
Hello all, Just to mirror Craig Grimmer's question about labile protons in non-aqueous solvents, does anyone know of an...
Posted: gravatar 83 / Updated: Arkadiusz Leniak 238 Mar 14 '15 at 11:24

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

Tool to extract several NMR spectra into text file format?

2 0 1k
answers votes views
Hi As a newbie in the NMR world I hope you guys can help me out with a simple Q: I have 104 1D spectra I would like to t...
Posted: Michael 1 / Updated: John Hollerton 96 Sep 10 '14 at 03:36

Very simple NMR question wrt resonance frequency calculation

6 0 15214
answers votes views
Hi guys, I'm stuck in attempting this question and need some help understanding how to answer it. Q.) The chemical shif...
Posted: Will Whitehouse 1 / Updated: SankarampadiAravamudhan 91 Apr 02 '14 at 00:25

using chenomx and missing peaks

1 0 2k
answers votes views
hello, I am trying to identify and quantify of metabolites present in semen with spectra obtained from 400 MHz NMR using...
Posted: Reza mohammadi 1 / Updated: Ulrich Haunz 210 Feb 10 '14 at 01:36

Relative quantification (residual solvents)

2 0 14980
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

Help solving a spectrum!

2 0 2k
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

NMR Vs X ray crystal data not matching each other

2 0 2k
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

2-Methoxybenzaldehyde

2 0 4k
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

how to simulate the impression of excitation of cpmg

0 0 1k
answers votes views
Hi? recently I try to use the bloch equation to simulate the magnetization M's variation, i used the perfect 90-degr...
Posted: da hsu 1 Apr 18 '13 at 18:51

Longer pulse length for conducting samples?

3 0 4k
answers votes views
Hi, my 1H 90 deg pulses are always longer when I work with my samples that are electrically conducting. Is this a/the re...
Posted: Santhosh 1 / Updated: glass lizard 31 Aug 12 '12 at 12:24

33S NMR Experiment

1 1 3k
answers votes views
Dear Everyone I´d like to run 33S-NMR experiments using a Bruker NMR spectrometer at 400 MHz buy I nedd the pulse seque...
Posted: Juan_Carlos 11 / Updated: Pete Gierth 401 Jun 15 '12 at 07:53

High Pressure NMR Samples

3 0 4k
answers votes views
I need to run NMR on samples of anhydrous ammonia. The boiling point of anhydrous ammonia is -33.34 deg C. In order to...
Posted: grant 1 / Updated: Damodaran Krishnan Achary 21 Feb 28 '12 at 14:09

Simple 1H-NMR Assignment Query

4 1 3k
answers votes views
Hi guys, sorry to be really cheeky and sign up simply to ask for help, but here goes. I've done a simple Grignard addit...
Posted: Brianstorm 11 / Updated: 3nath 11 Oct 26 '11 at 12:53

two triplets and no quartet?

4 1 5k
answers votes views
Hello all, I have spent approximately 4 hours trying to analyze an H NMR consisting of two doublets of doublets (pe...
Posted: Kelsey O'Dell 11 / Updated: joenmr 1 Feb 18 '15 at 10:44

Why is chemical shift range of 13C wider than of 1H nuclei?

6 3 15195
answers votes views
Why the chemical shift range of 1H nmr is ~20 ppm wheras for 13C nmr it is ~230 ppm? ...
Posted: sameer deka 31 / Updated: Yoan Monneau 136 Feb 15 '11 at 11:23

Inverted Spinning Sidebands

2 0 5k
answers votes views
Hello, My 1H MAS NMR spectrum comes out with the right spinning side band pointing up and the left one pointing down. ...
Updated: NMRUser61581 13 Jan 03 '11 at 10:04

J-Coupling In Proton NMR

1 1 5k
answers votes views
I'm currently a college student taking Organic Chem and I've no idea how to figure out the J-coupling for H-NMR and neit...
Posted: Scott 11 / Updated: Evgeny Fadeev 5771 Aug 07 '10 at 11:37

Are there ways to explain magnetic-field dependent chemical shift?

4 1 10799
answers votes views
Hi everyone, I was wondering whether anyone could help me to explain why the chemical shifts in my proton and carbon NM...
Posted: Guga Hollows 11 / Updated: Arkadiusz Leniak 238 May 31 '14 at 15:46
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