Table 1. Summary of Emission Properties of 1–4.

complex	medium	λexc (nm)	λem (nm)	lifetime	χ2	QY (%)
1	DMSO	375	460	τ1 = 1.77 ns	1.054	0.52
		435	657, 720, 790	τ1 = 1800.90 μs	1.039
	77 Ka	375	405, 430, 450, 494	τavrb = 9.49 ns	0.995
		370	631, 691, 762	τ1 = 169.67 ms	1.005
2	DMSO	375	450	τavrb = 2.12 ns	0.995	1.06
		420	636	τ1 = 1513.84 μs	1.016
	77 Ka	420	608, 663, 730	τ1 = 372.38 ms	1.078
3	DMSO	405	625	τ1 = 223.27 ns	0.993	3.11
	77 Ka	400	546	τavrb = 7.76 μs	0.999
4	DMSO	405	634	τ1 = 179.47 ns	0.956	3.82
	77 Ka	400	549	τavrb = 11.85 μs	0.973

^aEthanol:methanol (4:1 v/v) glassy matrix at 77 K.

^bAverage emission lifetime. For more details, see Figure S24 in the Supporting Information.