Electrochemical and photophysical data of compounds 2a–h. PC₆₁BM values were taken from the literature^46a.

Compound	λ abs (nm)	E g (eV)	E onset (V)	LUMO (eV)	HOMO (eV)
PC61BM	718	1.73	−0.90	−3.90	−5.63
2a	716	1.73	−1.09	−3.93	−5.66
2b	718	1.73	−1.08	−3.94	−5.67
2c	718	1.73	−1.09	−3.93	−5.66
2d	714	1.74	−1.13	−3.89	−5.63
2e	720	1.72	−1.07	−3.95	−5.67
2f	716	1.73	−1.02	−4.00	−5.73
2g	718	1.73	−1.10	−3.92	−5.65
2h	718	1.73	−1.09	−3.93	−5.66

^aValues obtained using the following formula ⁴⁵