Table 2.

Equilibrium, folding and unfolding rate constants, and free energy for the TBA G-quadruplex in different cations

M•TBA	r (Å)a	Kf (no unit)	kf (s−1)	ku (s−1)	ΔG° (kcal mol−1)b
Li+•TBA	0.60	1.5	0.095	0.065	−0.23
Na+•TBA	0.95	2.3	6.5	2.9	−0.48
K+•TBA	1.33	7.0	0.46	0.066	−1.1
NH4+•TBA	1.45	4.6	1.1	0.25	−0.89
Cs+•TBA	1.69	2.8	0.23	0.082	−0.61
Ba2+•TBA	1.35	4.2	0.25	0.061	−0.84
Mg2+•TBA	0.65
Ca2+•TBA	0.99

^aRef. (72).

^bΔG⁰ was calculated by ΔG⁰ = RT ln K_f/4.18.