Table 1.

Free energies for electron transfer and hole injection and values of β for distance-dependent electron transfer in DNA

Hairpin*	ΔGet†‡, eV	ΔGinj‡§, eV	β¶, Å−1
G-SA‖	−0.20	0.25	0.71  ± 0.07
Z-PA**	−0.24	0.50	1.1  ± 0.15
G-PA**	0.05	0.45	0.92  ± 0.09
I-PA**	0.21	0.29	0.8  ± 0.2

^*See Fig. 1 for structures. 

^† Calculated using Eq. 5 and the electrochemical data in Fig. 1. The difference in equilibrium oxidation potentials for G⁺Z vs. GZ⁺ is 0.19 ± 0.03 eV, smaller than the value 0.29 eV obtained from the electrochemical oxidation potentials for single nucleotides (Fig. 1; ref. 27). 

^‡ Estimated error ± 0.05 eV. 

^§ See Fig. 1. 

^¶ Calculated from the slopes in Fig. 3. Errors are estimated from the kinetic data. 

^‖ The value of β = 0.71 Å⁻¹ was obtained for G located in the polyA strand. A slightly smaller value of β = 0.64 ± 0.1 was obtained for G located in the polyT strand (29, 30). 

^**Data from this study.