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The main factor is the presence of water.
If the sample is NOT fully dried of water it will cause a big 'spike' in the spectrum .
lenpollock
Rodrigo Schoen
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∙ 15y agowhat are the factorswhich cause defects in NMR spectrum
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What is the NMR spectrum of acetylacetone?
what is the litreturevalue for enthalpy of enolization
How do you calculate the number of protons from NMR spectrum?
Answering "http://wiki.answers.com/Q/How_do_you_calculated_the_percentage_of_an_isomer_using_proton_nmr"
Where does water show up in a proton NMR spectrum?
about 1.6 ppm, but you don't always see it
In the H NMR spectrum why does 1 2-dichloroethane show up as a singlet and not a triplet?
The molecule is symmetric so all protons are equivilent. Equivilent protons cannot couple with each other, so the spectrum is a singlet.
What is the difference between NMR and FT- NMR instrumentation?
NMR Spectroscopy Use molecule Structure FT NMR Use Different No. of mass Structure
How will you distinguish between chloroform and carbon tetrachloride?
Well, they smell different, but boiling point, index of refraction, NMR or IR spectrum would be safer and more reliable methods.
How do you interpretation a cosy nmr?
cosy is a one of 2D-NMR technique
When was Journal of Biomolecular NMR created?
Journal of Biomolecular NMR was created in 1991.
What causes a multiplet in proton NMR?
Adjacent carbons have more than one H atom which causes splitting of peaks in the spectrum. Multiple peaks corresponding to one or more magnetically equivalent atoms are multiplets
Returned Mail came back with stamps crossed out and NMR written on the envelope What is NMR?
no mail recepticle
Can you use NMR in characterisation of nanomaterials?
It depends of course on the specific material, but it being nano-sized makes no difference at all to the NMR spectrum. Nuclear Magnetic Resonance works on the principles of excitation and emission of the nucleus of the atoms. Only certain nuclei are capable of being monitored using NMR spectroscopy. What is required is a nucleus with an odd number of particles in it (such as carbon-13, hydrogen-1, fluorine-19, etc) which have odd spin. However such nuclei are common to most materials and therefore should allow the use of NMR for characterisation of nanoparticles. You can learn more about the types of nuclei and physical properties of nuclei at NMRCentral.com
What has the author Michael T Huggins written?
Michael T. Huggins has written: '2D NMR-based organic spectroscopy problems' -- subject(s): Spectrum analysis, Problems, exercises, Nuclear magnetic resonance spectroscopy
