Table 1.

Absorption and emission maxima of 3c–g in the absence and presence of ct DNA and binding constants of their complexes with ct DNA.

	λabs / nma		Δλ / nm	Kb / 104 M−1b
	without DNA	with DNA
3c	398	415	17	6.0
3d	–	–	–	–
3e	393	405	12	5.9
3f	386	398	22	11
3g	394	409	15	6.4

^aIn Na phosphate buffer, c_Na+ = 16 mM, pH 7.0, 20 °C. ^bDetermined from photometric titrations.