Photophysical and optical data recorded for 8–13.

		λ max [nm]	λ ex [nm]	PL λem [nm]/Stokes shift [cm−1]	Φ a [%]	τ [ns] (weight %)	χ 2	k r·106b [s−1]	k nr·106b [s−1]	E opt c [eV]
8	Solution	277, 287, 365	254, 288, 365	403/2584, 421/3645	63.84	3.72 [0.04 (12.37) 4.24 (87.63)]	4	171.61	97.20	3.09
	Powder	—	284, 326, 364	493/7189	—	—	—	—	—	2.52
9	Solution	277, 286, 367	254, 286, 364	403/2434, 423/3607	63.37	2.37 [0.03 (18.07) 2.89 (81.93)]	1.023	267.38	154.56	3.08
	Powder	—	276, 326, 366	483/6619	—	—	—	—	—	2.57
10	Solution	276, 286, 359	254, 286, 360	405/3164	66.00	1.47 [0.03 (18.50) 1.78 (87.10)]	1.145	448.98	231.29	3.06
	Powder	—	278, 322, 366, 416	452/5199	—	—	—	—	—	2.74
11	Solution	275, 285, 359	252, 286, 362	404/3103	64.35	1.31 [0.04 (24.71) 1.73 (75.29)]	1.073	491.22	272.14	3.07
	Powder	—	274, 310, 402	459/3089	—	—	—	—	—	2.70
12	Solution	255, 298, 390	258, 302, 376	437/2758	89.00	1.98	1.053	449.49	55.56	2.84
	Powder	—	280, 336, 444	508/2837	—	—	—	—	—	2.44
13	Solution	259, 285, 297, 390	260, 302, 380	438/2810	94.83	1.69 [0.04 (19.10) 2.08 (80.90)]	1.091	561.12	30.59	2.83
	Powder	—	284, 368, 426	516/4095, 542/5024	—	—	—	—	—	2.40

^aAbsolute quantum yields obtained using an integrating sphere in optically diluted dichloromethane solutions at 298 K.

^bRadiative (k_r) and non-radiative (k_nr) decay rates, assuming that the emission excited states are produced with unit efficiency, were estimated using the following equations: k_r = Φ_em/τ; k_nr = (1 − Φ_em)/τ.

^c E ^opt = 1241/λ_em.