Table 1.

Experimental value of T ₁ and T _s of ¹³C₂‐TPE‐d₂₀, ¹³C₂‐DPP‐d_18, ¹³C₂‐DBC‐d_16, ¹⁵N, ¹⁵N’‐azobenzene‐d₁₀, ¹³C₂‐TPE, ¹³C₂‐DPP and ¹³C₂‐DBC.

Compounds	T s (s)	T 1 (s)
13C2‐TPE‐d20	243.5±20.9	22.7±0.1
13C2‐DDP‐d18	281.1±17.0	22.6±0.1
13C2‐DBC‐d16	26.8±1.8	15.2±0.0
15N, 15N‐Azobenzene‐d10	15.2±4.3	3.66±0.1
13C2‐TPE	47.8±7.1	16.1±0.1
13C2‐DDP	40.6±1.9	16.5±0.2
13C2‐DBC	20.3±4.0	12.3±0.3

All samples were degassed by three freeze‐pump‐thaw cycles.