Table 2.

UV/Vis/NIR data for 2 n⁺ _.

	UV/Vis/NIR λ [nm] (ϵ [L mol−1 cm−1])	IR/NIR λ [nm] ($\tilde{\nu }$ [cm−1]; ϵ [L mol−1 cm−1])
2	350 (sh), 455 (2520)	–
2+	430 (3560), 681 (1250)	2500 (4020; 740), 3176 (3149; 590)
22+	430 (4900), 683 (2200)	2459 (4060; 1060), 3175 (3150; 820)
23+	440 (13 500), 642 (6800), 860 (7200)	broad, featureless