Table 4.

Sugar radicals formed on photo-excitation of G•^+a,b

Compound	Temperature (K)c	Percent convertedd	C1′•e	C3′•e	C5′•e
2′-dG	143	90	10%	35%	55%
	77	30	10	40	50
5′-dGMP	143	95	95	5	–
	77	30	15	30	55
3′-dGMP	143	85	40	–	60
	77	15	40	–	60
dsDNA (ice)	143	∼50	100	–	–
	77	∼50	100	–	–

^aPercentage expressed to ±5% relative error.

^bAll glassy samples are at the native pH of 7 M LiCl (ca 5). For DNA, the pH of the aqueous solution before freezing was 7.

^cTemperature at which guanine radical cation was illuminated.

^dPercentage of guanine radical cation that converts to sugar radicals. The total spectral intensities before and after illumination were the same, within experimental uncertainties.

^eEach calculated as percentage of total sugar radical concentration; these sum to 100%.