Abstract
(1) The moments of 2·6 dimethyl-γ-pyrone, xanthone, and coumarin have been determined in benzene solutions at 10°, 20°, 30° and 40°C. The values for 20° are 4·48, 2·93 and 4·51 respectively. (2) The high moments for these pyrones are due to the state of resonance in which they exist, between the unexcited states of low moments and excited states of high moments. (3) The difference in value between the moments of dimethyl-γ-pyrone and xanthone must be due to the greater number of unexcited parent states for the latter. (4) The small difference between the calculated and observed moments for coumarin is due to the moments of some of the excited phases being in the opposite sense to the normal value.
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