Synthesis and characterization of three novel conjugated polythiophene derivatives

Figures & data

Scheme 1 Synthetic routes of the monomers and polymers.

Figure 1 ¹H NMR spectra of monomer 4 (TN), monomer 5 (TC), and monomer 6 (TO) in CDCl₃.

Figure 2 ¹H NMR spectra of polymers in CDCl₃.

Figure 3 The FT-IR spectra of monomers (a) and polymers (b).

Figure 4 The TGA plots of PTC, PTN, and PTO.

Figure 5 The UV–vis of three polymers in chloroform (a) and thin film (b).

Figure 6 Normalized fluorescence spectra of three polymers in chloroform (a) and thin film spin-coated from chloroform (b).

Figure 7 Cyclic voltammograms of PTC (a), PTN (b), and PTO (c) films on platinum electrode in boron trifluoride ether solution with a scan rate of 0.1 V/s.

Table 1. Comparison of the optical and electrochemical properties of PTC, PTN, and PTO.

	UV–vis λ max (nm)		PL λ max (nm)		CV
Polymer	CHCl3	Film	CHCl3	Film	ϕ ox (V)	ϕ red (V)	HOMO (eV)	LUMO (eV)	(eV)
PTC	398	413	553	585	0.49	−1.32	−5.20	−3.39	1.81
PTN	442	451	565	603	0.52	−1.49	−5.23	−3.22	2.01
PTO	475	507	589	660	0.71	−1.38	−5.42	−3.33	2.09

Figure 8 The SEM micrograph of PTC (a), PTN (b), and PTO (c).