Table 1.

Spectroscopic properties of CyDPA Zn(II) chelates in DMSO and aqueous solution

Compound	λAbs max (nm)	ε (M-1cm-1)	λem max (nm)a	Φ
In DMSO
CyDPA2	826	113,553	833	0.049
CyDPA1	668	12,050	793	0.097b
CyDPA0	756	79,464	811	0.058
ICG	795	210,000	820	0.13
In 50 mM HEPES containing 10% DMSO
CyDPA2	813	135,813	825	0.008
CyDPA1	698	8,675	796	0.031b
CyDPA0	748	82,533	810	0.037
ICG	782	64,640	807

^aλ_ext = 765 nm for CyDPA0 and CyDPA2; λ_ext = 578 nm for CyDPA1.

^bQuantum yield (Φ) was calculated using CVP (Cresyl violet perchlorate) as a reference.