Interested to Buy Any Domain ? << Click Here >> for more details...
Why we use TMS in NMR spectroscopy?
- 6 Answers
- 32517 Views
- Kurukshetra University, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / urmi
TMS is used as the internal reference in NMR spectroscopy because of its following characteristics:
> High volatility
> High solubility
> Chemically inert nature
> Shielding effect
| Is This Answer Correct ? | 39 Yes | 3 No |
Answer / bharat kumar mishra raipur ka
In nmr spectrum we usually take TMS our intarnal refernce because TMS has the following character which proves it to be most suitable one
1-it is volatile liquid having b.p.=26.5°C is inert to most of the reagents and is soluble in most of the organic solvent
2-when a very small amount is added to the sample it gives an intense sharp signal aven at low cone
3-all the hydrogen in TMS are equivalent and furter more silicon is more electropositive compound to carbon and tends to donate electron density to methyl group thier by increasing thier shielding
4-since its b.p. is low it can be easily removed from sample are pure compound can be recoverd
| Is This Answer Correct ? | 29 Yes | 2 No |
Answer / mehdi hatefi
TMS Stands for TetraMethylSilane.Si(CH3)4
Owing to the electronegativity difference between Silicon
and Carbon,electron density on carbon is greater than silicon and hydrogen atoms of methyl group are greatly shielded and compared to most of organic compounds,hydrogen atoms of TMS resonate at a higher frequncy that by definition sigma value for TMS is zero
| Is This Answer Correct ? | 29 Yes | 3 No |
Answer / syed roohul hussain
why tetramethyle silane is used as a standard in NMR spectroscopy?
Ans: Tetramethylsilane (abbreviated as TMS) is the organosilicon compound with the formula Si(CH3)4. It is the simplest tetraorganosilane. Tetramethylsilane is the accepted internal standard for calibrating chemical shift for 1H, 13C and 29Si NMR spectroscopy in organic solvents (where TMS is soluble) Because all twelve hydrogen atoms in a tetramethylsilane molecule are equivalent, its 1H NMR spectrum consists of a singlet.The chemical shift of this singlet is assigned as 0 (delta) δ or tau ( ʈ ) , and all other chemical shifts are determined relative to it.
| Is This Answer Correct ? | 9 Yes | 2 No |
Answer / scholar gul muhammad
highly volatile ,easily soluble,very short peak due these reason TMS choosen as standard
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / alliphiz
Its inert volatile liquid,its soluble,does not dissociate ,
| Is This Answer Correct ? | 1 Yes | 0 No |
Why some type of assays having limit 98% to102%? (if any compound having assay limit 100)
3 Answers Asia Pharma, Reddy Labs,
Trimethylamine is a pyramidal molecule. What is the hybridization at nitrogen?
What is valence tautomerism?
Which is more basic among pyridiene and piperidene
How many structural and geometric isomers are there with the formula C3H5Br ?
what is saponification of oils?
2 Answers Cipla, Indian Potash Limited,
As a chemist working with Protactinium, what safety measures and precautions would you take due to its radioactivity?
How do you get an observed rotation over 360 degrees by using a polarimeter.
Is LOD and LOQ values differ for different substrat (eg milk, tissue, egg etc.) for same compound (eg pesticide flumethrin)in same instrument(eg GC)?
why should mostely use KH2PO4&K2HPO4 in HPLC?
Why we are use glass viscometer, and what is calculation manual calculation formula as per USP. How many types of viscometre in glass type viscometer.
Why carotene exhibits colour nature?
Organic Chemistry 
