AS and A2 Chemistry notes and resources (WJEC specification) - UNIT CH4 Spectroscopy and Organic Chemistry (Analysing and building molecules)

This unit builds on the foundation ideas of spectroscopy and basic organic chemistry introduced at AS level and goes on to explore these concepts in more detail. It also explores the use of these topics in structure elucidation, in synthesis and in industrial and environmental applications.

TOPIC 9 - Spectroscopy

Candidates should be able to:

(a) recall the energy gradation across the electromagnetic spectrum from u.v. to visible to i.r. spectra;

(b) appreciate that energy levels can be split by a magnetic field, that certain nuclei, including 1H, possess intrinsic spin, and that measurements of the magnitudes of the interactions between the nuclear spin and the magnetic field are the basis of nuclear magnetic resonance spectroscopy;

(c) explain why some substances are coloured in terms of the wavelengths of visible light absorbed;

(d) explain the meaning of the term chromophore and give examples of chromophores in organic species, e.g. . N = N . in conjugated systems, including azo dyes.