Table 1.

¹³C (red/white dots) SABRE signal enhancement (ϵ) over the corresponding thermal measurement at 9.4 T after transfer at the indicated field (G), net polarization (P) and T ₁ and T _S lifetimes (s) of substrate 1–8 in high field (HF: 9.4 T) and low field (LF: ≈10 mT). The J‐coupling between the ¹³C spin‐pair was found to be about 58.5±2.0 Hz in all cases. The ΔJ _CH values for Type‐1 substrates, and the chemical shift difference (Δv) for Type‐2 substrates are noted.

Agent	Substrate structure	Enhancement (ϵ), transfer field, net polarization level P [%]	Lifetime [s]	ΔJ CH* or Δv@9.4 T [Hz]
1		ϵ: 2500±300 @30 G P≈2.0	T 1: 9.7±0.3 T S(HF): 75±5.5 T S(LF): 115±12	3.1±0.2*
2		ϵ: 1600±280 @150 G P≈1.3	T 1: 12.4±0.9 T S(HF/LF): –	2 J CD≈0.4*
3		ϵ: 600±50 @20 mG P≈0.5	T 1: 16.0±1.5 T S(HF/LF): No access	0
4		ϵ: 1600±300 @150 G P≈1.3	T 1: 10.2±0.6 T S(HF): 22±3.0 T S(LF): 28±6.5	11.0±0.1
5		ϵ: 550±50 @5 mG P≈0.45	T 1: 15.5±1.2 T S(HF): 90±3.0 T S(LF): 165±18	10.4±0.1
6		ϵ: 350±40 @10 mG P≈0.35	T 1: 10.4±0.3 T S(HF): 115±5.5 T S(LF): 148±20	14.5±0.4
7		ϵ: 600±50 @1 mG P≈0.50	T 1: 15.2±0.3 T S(HF): 145±6.0 T S(LF): 186±18	4.4±0.3
8		ϵ: 800±150 @10 mG P≈0.65	T 1: 7.5±0.5 T S(HF): <5 T S(LF): 45±6.0	78.8±0.5