Photophysical data for Eu(iii) complexes (100 mM PBS, pH 7.4).

Complex	λ max/nm	ε/M−1 cm−1	ϕ em a/%	τ H2O/ms	τ D2O/ms	q b
Eu.1	321	2800	10	0.52	0.66	0.2
Eu.8HQ	382	2100	<0.5	0.33	0.42	0.5
Eu.Bn	321	2600 (2560)	6 (6)	0.58 (0.37)	0.72 (0.44)	0.1 (0.2)

^aErrors in quantum yields and lifetimes are ±15%.

^bValues of hydration state, q (±20%) were derived using literature methods.³⁰ Values for Eu.Bn in parentheses were determined in water previously, by Williams.³¹