194 Applications and Occurrences of Heterocycles in Everyday Life
Tetrathiafulvalenes can be prepared in a number of ways, for example using 1,3-dithiole-2-thione-4,5-dithiolate, itself
prepared by reductive trimerisation of carbon disulfi de.
A number of electrofl uorescent materials, which emit light on application of an electric current, with potential for use
in OLEDs, are metal complexes with heterocyclic ligands. A well-established (and cheap) ligand, 8-hydroxyquinoline,
is popular but a number of purpose-designed ligands are also used.