Remember

Question 1

TMS

Answer 1

Example: S(CH3)4
Used: Calibration/Standard reference point
Properties: 1-Chemically Inert
2-Volatile
3-Non-toxic
4-Low Boiling point= distilled off + reused
5- 12 H produce single intense peak= Don’t
need to be reused
6-signal outside Range=won’t obscure Main
Signals

Question 2

Proton Free Solvents ( Deuterated Solvents)

Answer 2

Example: CCl4
Used: Dissolve sample
Properties: 1- Don’t interact with electromagnetic field
2-Don’t produce peaks on HMNR Spectrum
3- Contains no Protons H+