NMR ( Nuclear Magnetic Resonance), Study notes of Chemistry

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Model Institute of Engineering & Technology

NUCLEAR MAGNETIC

RESONANCE (NMR)

SPECTROSCOPY

Course name:Engineering chemistry Course code:BSC- Lecture no. 20 Date:19.5.

Course Outcomes

Course outcome 1-Delivery plan

Course outcomes Topics Bloom’s Taxonomy CO1 Summarize the chemical structure, molecular properties, vulcanization Applying

Principle of NMR

Applications of NMR

Working of NMR

Reading NMR Spectra

Outcomes of Today’s Lecture

INTRODUCTION

NMR is a spectroscopy technique which is based on the absorption of EM radiation in

the radio frequency region 4 to 900 MHz by nuclei of the atoms.

Proton NMR(nuclear magnetic resonance) spectroscopy is one of the most powerful

tools for explaining the number of hydrogen or proton in the compound.

The principle behind NMR is that many nuclei have spin and

all nuclei are electrically charged. If an external magnetic

field is applied, an energy transfer is possible between the

base energy to a higher energy level (generally a single energy

gap).

The energy transfer takes place at a wavelength that

corresponds to radio frequencies and when the spin returns to

its base level, energy is emitted at the same frequency.

PRINCIPLE OF NUCLEAR MAGNETIC RESONANCE (NMR) SPECTROSCOPY

PRINCIPLES OF NMR SPECTROSCOPY The theory behind NMR comes from the spin of a nucleus and it generates a magnetic field. (a) Normally the nuclear magnetic fields are randomly oriented w/o an external applied magnetic field. (b) When placed in an external magnetic field (Bo), the nuclear magnetic field can either be aligned with the external magnetic or oppose the external magnetic field.

(a)

(a) Randomly oriented (b) Aligned with external mag. field.

NMR SPECTRUM

NMR INSTRUMENTION

NMR INSTRUMENTION