Table 1.

Key Structures and Spectroscopic Properties of 1 and 2

compound	solvent	${\lambda }_{\text{abs}}^{\text{max}}\left(\text{nm}\right)$	ε (M−1 cm−1)	${\lambda }_{\text{abs}}^{\text{max}}\left(\text{nm}\right)$	ΦF	τF(ns)
1	methanol	740	270,000	772	0.24	0.91
	glycerol	751	165,000	776	0.26	0.83
	DCM	756	266,000	788	0.46	1.6
	H2Oa	736	107,000	771	0.064	0.37
	D2Oa	735	136,000	771	0.20	0.97
2	methanol	782	265,000	803	0.29	0.93
	glycerol	794	134,000	808	0.28	0.83
	DCM	775	303,000	811	0.40	1.7
	H2Oa	775	106,000	795	0.081	0.38
	D2Oa	770	107000	791	0.18	1.2

^aw/ 5% DMSO.