TMS Flashcards

1
Q

What does TMS have?

A

12 H all in same environment with no polarity

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2
Q

What is the chemical shift of TMS?

A

0

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3
Q

Draw TMS

A

Si with 4 methyl groups around it

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4
Q

Why does TMS give a single strong peak?

A

All protons are shielded exactly the same amount

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5
Q

Why is TMS used as a reference point?

A

1) Volatile - evaporates off leaving pure sample
2) Doesn’t interact with sample molecules - doesn’t modify environment so doesn’t affect chemical shift
3) Most organic compounds have chemical shifts that are positive compared to TMS

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6
Q

Why are atoms of H magnetic?

A

They have nuclear spin so are able to absorb radio waves. H atoms in different environments absorb different frequency radio waves. Wavelength reveals environment of H

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