Question

How a chemical of a compound is measured relating to tetramethysilane(TMS)? ​

Answer 1

Answer:

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Explanation:

Reference Compounds

Tetramethylsilane became the established internal reference compound for 1H NMR because it has a strong, sharp resonance line from its 12 protons, with a chemical shift at low resonance frequency relative to almost all other 1H resonances. Thus, addition of TMS usually does not interfere with other resonances. Moreover, TMS is quite volatile, hence may easily be removed if recovery of the sample is required. TMS is soluble in most organic solvents but has very low solubility in water and is not generally used as an internal reference in aqueous solutions. Other substances with references close to that of TMS have been employed, and the methyl proton resonance of 2,2-dimethylsilapentane-5-sulfonic acid (DSS) at low concentration has emerged as the reference recommended by IUPAC for aqueous solutions.55 Careful measurements of the DSS–TMS chemical shift difference when both materials are dissolved at low concentration in the same solvent have shown that for DSS δ = + 0.0173 ppm in water, and δ = − 0.0246 ppm in dimethyl sulfoxide. Thus, for most purposes, values of δ measured with respect to TMS or DSS can be used interchangeably.

Answer 2

Answer:

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Explanation:

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