Table 1.

Experimental optical properties of monomers 3  a–c, dimers 3  a₂ –c₂ and trimers 3  a₃‐c₃   in solution (CH₂Cl₂).

Compd	λ max, abs	λ onset, abs	λ max, em	Stokes shift	Quantum	Lifetime
	[nm]	[nm]	[nm]	[cm−1]	yield [%][a]	[ns]
3  a	458	472	472	648	79	7
3  a2	472	489	536	2530	17	12
3  a3	478	499	540	2402	18	11
3  b	463	525	524	2515	<5[b]	–[b]
3  b2	–	–	–		–	–
3  b3	460	480	548	3490	<5	–[b]
3  c	602	672	648	1180	<5	–[b]
3  c2	622	672	678	1328	<5	–[b]
3  c3	633	682	673	939	<5	–[b]

[a] A reference method using quinine sulfate was employed. ^[13] [b] Emission was too weak for an exact measurement.