N-Benzoyl dithieno[3,2-b:2′,3′-d]pyrrole-based hyperbranched polymers by direct arylation polymerization

BMC Chemistry

Table 1 Characteristics of hyperbranched conjugated polymers prepared via direct arylation polycondensation of monomers 1, 3 and 4 (PBDP3HTTPA)^a, and of monomers 2, 3 and 4 (PBD3HTTBP)^b

Entry	Polymer	Temp (^oC)	Yield (%)^c	M_n (g mol⁻¹)^d	M_w/M ^d_n	3HT: BD: TPA (TPB) molar ratio^e (r)
1	PBDP3HTTPA	100	82	18,000	2.1	1:1.18:1.45
2	PBDP3HTTPB	100	90	16,700	2.3	1:1.38:1.59

^aConditions: [1]₀ = 44 mM; [3]₀ = [4]₀ = 33 mM; [Pd(OAc)₂] = 1.6 mM; [PCy₃.HBF₄]₀ = 3.0 mM; [PivOH]₀ = 30 mM
^bConditions: [2]₀ = 44 mM; [3]₀ = [4]₀ = 33 mM; [Pd(OAc)₂] = 1.6 mM; [PCy₃.HBF₄]₀ = 3.0 mM; [PivOH]₀ = 30 mM
^cAfter removal of chroloform-insoluble and acetone-soluble fractions
^dDetermined by GPC with THF as eluent and polystyrene calibration
^eMolar ratio between 3-hexylthiophene, N-benzoyl dithieno[3,2-b:2′,3′-d]pyrrole and triphenylamine (or triphenylbenzene) units calculated by ¹H NMR, based on the integration ratio between peak f at 2.6 ppm and o at 7.7 ppm (Fig. 2a) for P3HT3HTTPA, and the integration between peak f and overlapping shift range of peaks l, m and n around 7.75 ppm for P3HT3HTTBP

ISSN: 2661-801X