MYTUTOR SUBJECT ANSWERS

217 views

Proton NMR Made Easier

Proton or 1H NMR can look complicated but with practice; there are techniques that can make the peak assignment a little easier.

1. Make sure you count the proton environments correctly, if the molecule displays a form of symmetry you may count an identical environment!

2. If there is a multiplet at 7.2 ppm - this is always indicative of a benzene like ring.

3. Electronegative groups (N, O, Cl, F) cause de-shielding, moving protons in these environments further down the spectrum, use this as an indicator to find which hydrogens are those near functional groups. In contrast, branching alkane groups CH2 and chain end CH3 will mostly have quite low chemical shift.

4. The (n+1) rule can be used if you have proteins in a similar environment. The peak for a proton environment will split if a carbon adjacent to the one the proton you're observing is attached to protons in a different environment - This will cause the peak to split into (n+1) little peaks, where n is the number of protons on neighbouring carbon.

5. Often NMR questions will have other analysis such as MS in the same question. If your molecule you propose based on your NMR isnt compatible with the MS, try again - always look for differences in 14 m/z values for alkane chains etc.

These questions are worth a lot of marks so take your time.

Martin L. GCSE Maths tutor, A Level Maths tutor, GCSE Chemistry tutor...

5 months ago

Answered by Martin, an A Level Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

94 SUBJECT SPECIALISTS

£22 /hr

Sarah M.

Degree: Biochemistry (Bachelors) - Birmingham University

Subjects offered:Chemistry, Science+ 2 more

Chemistry
Science
Maths
Biology

“Hi, I am a Biochemistry student at Birmingham and love science! I hope to inspire others through teaching and will be starting teacher training in September!”

£20 /hr

Heather W.

Degree: Chemistry (Bachelors) - Warwick University

Subjects offered:Chemistry, Maths

Chemistry
Maths

“Top tutor from the renowned Russell group university: University of Warwick. Ready to help you reach your goals and gain confidence!”

MyTutor guarantee

£20 /hr

Oliver G.

Degree: Chemistry with Medicinal Chemistry (MChem) (Masters) - Newcastle University

Subjects offered:Chemistry, Biology

Chemistry
Biology

“My name is Oliver. I'm a third-year chemistry student and I'm ready to help you improve your grades.”

MyTutor guarantee

About the author

Martin L.

Currently unavailable: for regular students

Degree: Chemistry (Bachelors) - Warwick University

Subjects offered:Chemistry, Maths

Chemistry
Maths

“About Me: I am currently a third-year student studying Chemistry at the University of Warwick; and have had tutor experience at my secondary school. I take a patient approach to tutoring and believe that a lot of the concepts they tea...”

You may also like...

Posts by Martin

Proton NMR Made Easier

What is a stationary point on a curve? How do I calculate the co-ordinates of a stationary point?

Other A Level Chemistry questions

When composing a mechanism in organic chemistry, how do I use curly arrows?

What is a buffer solution? How to make a buffer solution?

Describe how you test for an aldehyde or ketone and distinguish between the two.

What are Van Der Waals dispersion forces?

View A Level Chemistry tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok