Synthesis and Optical Properties of Triphenylene-Based Donor-Donor and Donor-Acceptor Conjugated Polymers: A Comparative Study

Table 2

Emission maxima (excited at the corresponding absorption maximum) and fluorescence quantum yields of P1 and P2 as very dilute solutions (maximum absorbance: ca. 0.1) in different solvents.

Solvent	P1		P2
	(nm)	^a	(nm)	^a
Hexane (1.9)	543	0.021	519^c	0.070^c
p-Xylene (2.268)	525	0.093	585	0.121
Benzene (2.27)	526	0.091	590	0.103
Toluene (2.38)	524	0.073	588	0.090
Anisole (4.33)	526	0.039	604	0.007
CHCl3 (4.81)	524	0.052	611	<0.001
THF (7.58)	522	0.092	606	0.013
ODCB (9.93)	530	0.112	612	0.004
DMF (36.7)	524^b	0.015^b	—^b	<0.001^b
DMSO (46.7)	585^b	0.001^b	647^b	<0.001^b

^aFluorescence quantum yield. ^bDue to the very poor solubility of P1 and P2 in DMF and insolubility of P1 and P2 in DMSO, these solutions were prepared by adding a very small amount of concentrated CHCl₃ stock solution of P1 or P2 to respective solvents. ^cP2 has poor solubility in hexane, and the upper, clear portion of a saturated P2 solution in hexane was collected and diluted for measurement. The numbers in brackets are the dielectric constants of the solvents.