Table 1.

Photophysical parameters for 1 and 2, their RGD conjugates, (1a and 2a), and 3 in organic solvents and organic nanoparticles (3a and 3b)

Compound	Solvent	${\lambda }_{\mathit{max}}^{\mathit{abs}}$ a/nm	${\lambda }_{\mathit{max}}^{em}$ a/nm	Δλ b/nm	Φf c
1	Toluene	461	585	124	0.35
	DCM	458	704	246	0.38
	DMSO	454	789	335	0.01
1a	DMSO	455	789	334	0.02
2	DMSO	308, 360, 463	652	199	0.02
	H2O	308, 361, 469	720	251	0.01
2a	DMSO	310, 353, 454	754	300	0.02
3	Toluene	449	591	142	0.31
	DCM	445	767	322	0.03
3a	H2O	449	648	199	0.03
3b	H2O	450	662	212	0.05

^aAbsorption and emission maxima ±1 nm;

^bStokes shift ±2 nm;

^cfluorescence quantum yields ±10%