Table 2. Thermodynamic parameters of the three i-motif structures of d(CCCTAA)^a.

	ΔH° (kJ/mol–1)a	ΔS° (J/K/mol)a	ΔG° (kJ/mol)b
R-form	–285	–808	–48.6
S-form	–313	–904	–47.9
T-form	–343	–1013	–46.2

^aCalculated by the NMR denaturation profile. Standard deviations of ΔH° and ΔS° values are ±13 kJ/mol and ±34 J/mol/K, respectively.

^bCalculated at 20°C. The standard deviations of ΔG° and ΔΔG° (see text) are ±1.3 and 0.2 kJ/mol, respectively.