Table 3. Relevant solution state photophysical data for complexes 1–3 ^a .

Complex	λ em  b (nm)	Φ PL  c (%)	τ e  d (μs)	k r × 105 s–1	k nr × 105 s–1
1	515	72	1.36	5.29	2.06
2	515	80	1.37	5.84	1.46
3	459, 487	90	2.19	4.11	0.46
3 e	458, 489	82	2.26	3.63	0.80
4 e , f	457, 487	68	3.84	1.77	0.83

^aMeasurements at 298 K in deaerated MeCN unless otherwise stated otherwise.

^b λ _exc: 360 nm.

^cQuinine sulfate used as the reference (Φ _PL = 54.6% in 0.5 M H₂SO₄ at 298 K).²⁵

^d λ _exc: 375 nm.

^eMeasured at 298 K in deaerated MeOH.

^fData taken from ref. 11b .