R a p h a e l Darcy
Unwersty College Dublm 4, Ireland
A Versatile Chemical System for Instruction in ESR Spectroscopy
nri,hlems. T h e use of flow systems or low-temperature equipment is not practical for large classes and may limit the choice of a paramagnetic species to a simple nitroxide or metal complex. Chemical transformations, to be of ESR-spectroscopic interest, must he carried out a t positions of high spin density in a molecule, and usually this is not possible with such compounds without destroying their paramagnetism. The ESK experiment, therefore, has to he limited to demonstration of a static system.
DMSO solution is treated with approximately 20 mg af PbOr: (III), henzeneschtion is treated with Ph02; (1V) aqueoussolution is treated with 1M KOH, follmved by PbOn: (V) aqueous solution is treated with a few drops ~ 1 ' 0 .M 5 aqueous Hglll) acetate, fdl
