Table 1. Summary of Main NIR and IR Absorption Bands of Radical Cations^a.

	Q-band		P1 band			P2 band			C≡C stretch
compound	εmax [M–1 cm–1]	f	νmax [cm–1]	εmax [M–1 cm–1]	f	νmax [cm–1]	εmax [M–1 cm–1]	f	νmax [cm–1]	εmax [M–1 cm–1]	f
l-P2+•	2.2 × 104	0.05	3907	5.1 × 104	0.53	10511	9.3 × 104	0.37	2079	1.9 × 104	0.0041
l-P3+•	5.2 × 104	0.19	3599	5.9 × 104	0.54	9961	1.3 × 105	0.61	2061	4.6 × 104	0.0072
l-P4+•	7.7 × 104	0.39	3332	5.7 × 104	0.61	9813	1.2 × 105	0.50	2055	6.3 × 104	0.0132
l-P5+•	1.4 × 105	0.85	3387	7.7 × 104	1.01	9733	1.4 × 105	0.68	2057	5.3 × 104	0.0114
l-P6+•	1.9 × 105	1.33	3506	5.9 × 104	0.77	9749	1.2 × 105	0.69	2057	4.6 × 104	0.0099
c-P6+•	–	–	3330	3.6 × 104	0.32	9071	4.6 × 104	0.26	2032	5.5 × 104	0.0220
c-P6·T6+•	–	–	2197	1.2 × 105	0.54	8669	7.3 × 104	0.35	2180	–	–
t-P12·(T6)2+•	–	–	2165	7.6 × 104	0.62	8944	4.1 × 104	0.17	2150	–	–

^aExperimental conditions: spectroelectrochemistry in CH₂Cl₂/Bu₄NPF₆ at room temperature. ν_max is the energy of the absorption maximum; ε_max is the peak molar absorption coefficient and f is the oscillator strength from the area of the absorption band: f = 4.319 × 10^–9 ∫ ε dν. Experimental errors are difficult to quantify due to the complexity of the curve-resolution process, but we estimate that values of ν_max are accurate to ±100 cm^–1; values of ε_max and f have uncertainties of about 20%; “–” means not determined.