Experimental Cr(²E) lifetimes (τ) and radiative (k_rad) and non-radiative (k_non-rad) relaxation rate constants and intrinsic quantum yields (ϕ^intrinsic_complex = k_rad/(k_rad + k_non-rad)) of chromium complexes.

Complex	k rad/s−1	τ 293 K, Ar a/μs	k 293 K, Ar  a/103 s−1	ϕ intrinsic 293 K, Ar	τ 293 K, air b/μs	k 293 K, air  b/103 s−1	ϕ intrinsic 293 K, air	τ 77 K c/μs	k 77 K /s−1	ϕ intrinsic 77 K	Ref.
[Cr(H2biim)3]3+	75(4)	0.47(2)d	2120(106)	3(1) × 10−5	0.44(2)d	2260(113)	3(1) × 10−5	2950(150)e	263(13)	2.0(6) × 10−1	This work
[Cr(Hbiim)2(biim)]−	—	0.178(9)d	—	—	0.141(7)d	—	—	2780(140)e	—	—	This work
[Cr(Me2biim)3]3+	73(4)	4.28(4)d	234(12)	3(1) × 10−4	3.31(9)d	302(1)	2.4(8) × 10−4	3005(150)e	260(13)	2.2(7) × 10−1	This work
[Cr(phen)2(H2biim)]3+	65(3)	38(1)f	26(7)	2.5(8) × 10−3	14(1)f	71(7)	9(3) × 10−4	2940(140)g		1.9(6) × 10−1	This work
[Cr(bpy)3]3+	182	74h	13.3	1.4(4) × 10−2	52h	19	9(3) × 10−3	5000i	18	9(3) × 10−1	54, 58 and 70–72
		39d	25.5	7(2) × 10−3	29d	34	5(2) × 10−3	6500j	≈0	≈1
[Cr(phen)3]3+	319	356h	2.49	1.1(4) × 10−1	74h	13	2.4(7) × 10−2	2100g	157	6.7(2) × 10−1	53, 54, 58 and 70–73
		34d	29.1	1.1(3) × 10−2	22d	45	7(2) × 10−3	5300j	≈0	≈1
		224f	4.15	7(2) × 10−2	37f	27	1.2(3) × 10−2
		270k	3.38	9(3) × 10−2
[Cr(tpy)2]3+	—	—	—	—	0.14f	—	—	540i	—	—	61, 74 and 75
								670g	—
[Cr(dqp)2]3+	30	1270h	0.76	4(1) × 10−2	83h	12	2.5(8) × 10−3	3070i	296	9(3) × 10−2	24
		2140f	0.44	6(2) × 10−2	31f	32	9(3) × 10−4		296	9(3) × 10−2
[Cr(CN)6]3−	97	—	—	—	0.12i	8330	1.2(4) × 10−5	3950i	156	4(1) × 10−1	72
[Cr(bik)3]3+	31	209f	4.75	7(2) × 10−3	128f	7.8	4(1) × 10−3	8220g	91	2.6(8) × 10−1	57
[Cr(bim)3]3+	37	131f	7.60	5(2) × 10−3	73f	14	2.7(8) × 10−3	6750g	111	2.5(8) × 10−1	57
[Cr(bie)3]3+	60	7f	143	4(1) × 10−4	8f	125	5(2) × 10−4	5250g	130	3(1) × 10−1	57

^aRecorded in degassed solution at room temperature.

^bRecorded in air-equilibrated solution at room temperature.

^cRecorded in a frozen solvent mixture at 77 K.

^dIn MeOH.

^eIn MeOH/H₂O.

^fIn CH₃CN.

^gIn CH₃CN/C₂H₅CN.

^hIn H₂O.

ⁱIn H₂O/DMSO.

^jIn aq. HClO₄/MeOH.

^kIn aq. HCl.