Table 1.

Optical and electrochemical properties of 1–4 in comparison to other compounds in the literature.

compound	λmaxsol [nm]a	εmaxsol [mol−1·L·cm−1]b	λmaxfilm [nm]	Egopt [eV]c	E0ox [V]d	E0red [V]d,e	EHOMO [eV]f	ELUMO [eV]f	Egcv [eV]g	ref.
1	440 (498)h	64,500	580 (547)h	1.94	0.66	−1.53	−5.68 (−5.38)i	−3.65 (−3.35)i	2.03	[20]
2	494	68,800	558 (602)h	1.86	0.50	−1.62	−5.52 (−5.22)i	−3.56 (−3.26)i	1.96	this work
3	491	80,700	576 (625)h	1.82	0.42	−1.63	−5.43 (−5.13)i	−3.55 (−3.25)i	1.88	this work
4	485	93,900	570 (614)h	1.82	0.32	−1.64	−5.35 (−5.05)i	−3.53 (−3.23)i	1.82	this work
DCAO3TBDT	494	72,000	560	1.84	—	—	−5.04i	−3.24i	1.80	[23]
TBDTCNR	488	—	578	1.75	—	—	−5.40i	−3.63i	1.77	[21]

^aIn CHCl₃ (5.0 × 10⁻⁵ mol·L⁻¹); ^bextinction coefficient was obtained by linearly fitting the absorbance as a function of the concentration; ^coptical band gap, calculated from the absorption onset wavelength (λ_onset) in solid films according to the equation E_g^opt (eV) = 1240/λ_onset (nm); ^dmeasured in CHCl₃ solution (1.0 × 10⁻³ mol·L⁻¹); ^eirreversible wave: E⁰_red was estimated as the potential where i_pc = 0.855 × i_pc^max; ^fcalculated from the cyclic voltammograms, E_HOMO = −[E_ox^onset + 5.1] (eV), E_LUMO = −[E_red^onset + 5.1] (eV); ^gelectrochemical band gap E_g^cv= E_HOMO − E_LUMO = −[E_ox^onset − E_red^onset] (eV); ^hshoulder peak; ⁱcalculated from the cyclic voltammograms, E_HOMO = −[E_ox^onset + 4.8] (eV), E_LUMO = −[E_red^onset + 4.8] (eV).