Table 4.

Experimental UV/vis absorption spectral data.

	Solution: CH2Cl2 a)					Thin Film a)
Compound	λBF2 [nm]	εBF2 b) [M−1 cm−1]	λFL/Bn [nm]	εFL/Bn b) [M−1 cm−1]		λBF2 [nm]	λFL/Bn [nm]
Ph‐BF2‐Ph	575	39000	‒	‒		595	‒
Ph‐FL‐Ph	‒	‒	380 c)	100000		‒	390 c)
Ph‐Bn‐Ph	‒	‒	387	44000		‒	416
BF2‐BF2‐BF2	586	93250	‒	‒		617	‒
P‐FL	‒	‒	421 c)	72000		‒	390 c)
P‐Bn	‒	‒	459	40250		‒	461
P‐BF2‐FL	598	19750	379	30750		608	379
P‐BF2‐Bn	600	19750	397	17000		614	398
P‐FL‐Bn	‒	‒	424	42250		‒	420
Ph‐Co‐BF2‐Co‐Ph	595	32750	‒	‒		‒	‒
Ph‐Co‐FL‐Co‐Ph	‒	‒	374 d)	38500		‒	‒
Ph‐Co‐Bn‐Co‐Ph	‒	‒	384 d)	19750		‒	‒
Co‐P‐BF2‐FL	592	13000	375 d)	24750		‒	‒
Co‐P‐BF2‐Bn	595	11750	390 d)	9000		‒	‒
Co‐P‐FL‐Bn	‒	‒	370	19250		‒	‒

^a) Hyphens indicate that no absorption band was observed or measured;

^b) Molar absorptivity values reported for polymers were calculated using the average molecular weight of the repeating units based on the NMR ratio of the repeating units;

^c) λ _FL represents fluorene‐based transition with maximum absorbance; and

^d) Value extracted from the middle of the shoulder. Values reported for P‐FL and P‐Bn closely match previously reported values.^{[ 25} , ^{52 ]}