Table 2. Deuterium Kinetic Isotope Effect for Excited State Quenching of Ir2 and Ir2-d with Ant at 23 °C^a.

entry	Ir compound	[Ant] (mM)	τrise (ns)	kq (× 109 M–1 s–1)
1	Ir2	0	1.01	6.8 (3)
2		24	0.871
3		48	0.749
4		74	0.647
5		112	0.587
6	Ir2-d	0	1.23	6.0 (2)
7		24	1.09
8		48	0.888
9		74	0.796
10		112	0.676

^aKIE = (k_q with Ir2)/(k_q with Ir2 – d) = 1.13 (6).