Synthesis, characterization, and optical properties of poly[2-(4-(2,2′-bithiophen-5-yl)phenyl)-4-(4-alkoxyphenyl)-6-phenylpyridine]s

Figures & data

Scheme 1 Monomers synthesis.

Figure 1 Compared FTIR spectra of synthesized monomers.

Figure 2 ¹H NMR spectrum of R1.

Figure 3 ¹³C NMR spectrum of R1.

Figure 4 ¹H NMR spectrum of R₂.

Figure 5 ¹³C NMR spectrum of R₂.

Figure 6 ¹H NMR spectrum of R₃.

Figure 7 ¹³C NMR spectrum of R₃.

Scheme 2 Polymers synthesis.

Figure 8 Compared FTIR spectra of synthesized polymers.

Figure 9 ¹H NMR spectrum of P₁.

Figure 10 ¹H NMR spectrum of P₂.

Table 1. Molecular weight of synthesized polymers.

Polymers	Mn (g/mol)^a	Mw (g/mol)^a	PDI^a
P1	23,130	28,010	1.21
P2	–	–	–

^aNumber and weight average molecular weight and polydispersity index obtained using GPC.

Figure 11 Compared TGA thermogram of synthesized polymers.

Figure 12 Compared DSC thermogram of synthesized polymers.

Figure 13 Compared UV–vis spectra of synthesized polymers both in solution and solid state.

Table 2. Optical and electrochemical properties of synthesized compounds.

Polymers	λoneset (nm) (in film)	λoneset (nm) (in THF)^c	λmax (nm) (in THF)^c	Eox, onset (V)	Ered, oneset (V)	HOMO (eV)	LUMO (eV)	Eg.cv (eV)^a /Eg.opt (eV)^b
P1	570	580	430	0.97	−1.16	−5.28	−3.15	2.13/2.17
P2	600	580	420	1.1	−0.99	−5.41	−3.32	2.09/2.13

^aBand gap in cyclic voltametry.^bBand gap in optical absorbtion.Notes: LUMO = −e(E_red, onset vs. Ag/AgCl − E_{1/2, ferrocene})−4.8 (eV); HOMO = −e(E_ox, onset vs. Ag/AgCl − E_{1/2, ferrocene})−4.8 (eV); E_{1/2, ferrocene} = 0.488.

Figure 14 Cyclic voltammogram of P₁.

Figure 15 Cyclic voltammogram of P₂.