Table 2. Substrate to catalyst (3) ratio, signal gain and relaxation data associated with protons H-4 and H-5 of atz in d ₄-methanol, determined using an automated polariser¹⁵ with 3a and 3b .

Complex		3a		3b
3 : atz ratio		1 : 2	1 : 17	1 : 2	1 : 17
Signal gain	H-4	–456	–113	–441	–356
	H-5	–693	–127	–547	–425
T1 (s)	H-4	10.0 ± 0.4	15.1 ± 0.3	12.2 ± 0.5	16.2 ± 0.6
	H-5	18.5 ± 0.6	22.9 ± 0.3	23.7 ± 0.8	25.0 ± 0.8
TLLS (s)		16.5 ± 3.2	18.3 ± 2.8	13.3 ± 2.6	26.8 ± 3.9