Table 3.

Absorption, emission and triplet-state properties of the promazine derivatives measured in methanol

Phenothiazine derivative	λmax (nm) [ε(M−1cm−1) × 10−4]	λmax (nm) , Stoke’s Shift (cm−1), φf × 103 and τf (ns)	λmax (nm), εT × 10−4 (M−1cm−1), φT, τT (µs)
PZ 2a	255 [3.3 ± 0.2],	444	460
	307 [0.42 ± 0.03]	10,050	2.65
		4.5	0.41
		1.75 †	61
CPZ 2b	258 [3.66 ± 0.01],	449	460
	311 [0.46 ± 0.01]‡	9,474	1.95
		0.95	0.90
		0.89 †	2.2 §
CMPPH 3b	258 [3.41 ± 0.03],	--	--
	313 [0.44 ± 0.02]

^†Values from reference (19).

^‡Corresponding values in ethanol are: 257 [3.26 ± 0.04], 308 [0.409 ± 0.001], 313 [0.400 ± 0.001]; 1-propanol: 257 [3.83 ± 0.06], 309 [0.472 ± 0.001], 313 [0.461 ± 0.001]; 2-propanol: 257 [3.37 ± 0.03], 309 [0.417 ± 0.002], 313[0.408 ± 0.002]; and t-butanol: 257 [3.21 ± 0.05], 310 [0.398 ± 0.001], 313 [0.391 ± 0.001].

^§Values from reference (20).