Table 4. k _ISC and τ _ISC of the Au(i) and Au(iii) complexes.

Complex	k ISC a /107 s–1	τ ISC b /ns	Complex	k ISC b /1010 s–1	τ ISC c /ps
1a	<0.75	133	1b	7.57	13.2
2a	<11.1	9.0	2b	11.9	8.38
3a	<7.9	12.7	3b	28.7	3.49
5a	<0.91	110
6a	<1.14	87.5

^a k _ISC for 1a–3a, 5a–6a are calculated according to eqn (1).

^b τ _ISC = 1/k _ISC.

^c τ _ISC of 1b–3b is estimated from τ ₂ obtained from the fs-TA spectra of ESA1.