. 2026 Sep 28. Online ahead of print. doi: 10.1039/d6sc05072g

Table 1. Selected solution photophysical properties of the lanthanide(iii) bispidine complexes of the fully deprotected ligands [EuL^1a](NO₃), [SmL^1a](NO₃), [TbL^1b](NO₃), [DyL^1b](NO₃), and [YbL^1c](NO₃) at 298 K alongside data of the parent complexes [EuL¹](CF₃CO₂), [TbL¹](NO₃) and [YbL¹](NO₃)^a^,^b.

Compound	Media	λ _{abs max} (nm)	ε (L mol⁻¹ cm⁻¹)	τ (µs)	Φ ^c ^, ^d	B (L mol⁻¹ cm⁻¹)
[EuL^1a][NO₃]	H₂O (D₂O)	323	22 000	1230 (1640)	12%	2600
	MeOH			1580	27%
	Buffer^b			1210	17%
[Sm^1a][NO₃]	H₂O	323	23 000	21	0.29%	67
[Sm^1a][NO₃]	MeOH	323	23 000	28	0.53%	67
[TbL^1b][NO₃]	H₂O (D₂O)	310	14 500	1840 (2010)	51%	7400
	MeOH			1300	34%
	Buffer^b			1740	52%
[DyL^1b][NO₃]	H₂O	310	19 000	<10	0.37%	7
[DyL^1b][NO₃]	MeOH	310	19 000	<10	0.39%	7
[YbL^1c][NO₃]	H₂O	390	22 000	3.4	0.15%^e	33
[YbL^1c][NO₃]	MeOH	390	22 000	5.8	0.36%^e (0.67%^f)	33
[EuL¹][CF₃CO₂]^a	H₂O (D₂O)	314	8000	1510 (2150)	35%
[TbL¹][NO₃]^a	H₂O (D₂O)	313	9000	1950 (2150)	68%	6120
[YbL¹][NO₃]^a	H₂O	312	9500	3.6	n.d.	—

Data for the L¹-based complexes from ref. 13.

Buffer used: HEPES pH 7, 0.1 M.

Precision ±5%.

Using quinine bisulfate in 0.5 M H₂SO₄ as the standard (Φ = 0.546). Excitation wavelengths for quantum yields were 335 nm for [EuL^1a], 335 nm for [SmL^1a], 306 nm for [TbL^1b], and 306 nm for [DyL^1b].

Using Yb(TTA)₃Phen as a reference for NIR emission quantum yield in toluene (Φ = 1.1%), λ_ex. = 350 nm.^39,42

Ligand-centered luminescence.

Table 1. Selected solution photophysical properties of the lanthanide(iii) bispidine complexes of the fully deprotected ligands [EuL1a](NO3), [SmL1a](NO3), [TbL1b](NO3), [DyL1b](NO3), and [YbL1c](NO3) at 298 K alongside data of the parent complexes [EuL1](CF3CO2), [TbL1](NO3) and [YbL1](NO3)a,b.