Analysis of the temperature dependence of the EPR spectrum of 20 supports a high-spin configuration (i.e., S = 5/2). Warming the sample from 4K to 77K results in the disappearance of the rich spectral features; only a signal at g = 2.0 which we hypothesize is from an organic radical generated in the photolysis. Subsequent re-cooling of the sample to 4K results in the reappearance of the spectral features illustrated in Figure (Figure ). These observations confirm that the loss of spectral features upon warming to 77K is due to spin-spin relaxation and not sample degradation.