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. 2019 Mar 19;10(20):5235–5245. doi: 10.1039/c9sc00444k

Table 3. ¹H and ¹³C signal enhancements (ε) and ¹³C₂ singlet lifetimes of deuterated analogues.

Complex	ε ¹H hydride/fold	ε ¹³C₂ imine/fold	¹³C₂ singlet lifetime/s
1A-d₁₄	110	510	7.9 ± 0.9
1A-d₃₈	300	560	19.9 ± 1.0
1A-¹⁵N-d₂₄	480	750	17.5 ± 3.9
2A-d₃₂	740	340	N/A
2A/3A	N/A	2A, 220	N/A
2A/3A	N/A	3A, 190	N/A
2A-d₃₂/3A-d₃₃	2A-d₃₂, 720	2A-d₃₂, 330	N/A
	3A-d₃₃, 380	3A-d₃₃, 260
	3A-d₃₃, 380	Pyridine, 0
2A/3A-¹⁵N	2A, 230	2A, 230	N/A
	3A-¹⁵N, 390	3A-¹⁵N, 260
	3A-¹⁵N, 390	Pyridine, 190
1A-¹⁵N-d₂₄/3A-¹⁵N₂-d₂₄	1A-¹⁵N-d₂₄, 1620	2A N/A ^a	N/A
	3A-¹⁵N₂-d₂₄, 590	3A-¹⁵N, N/A ^a
	3A-¹⁵N₂-d₂₄, 590	Pyridine, 870

^aSpectral overlap prevents signal enhancements being calculated for each complex. Note pyridine enhancements include bound and free signals.