Table 2. Selected distances and angles (Å, °) of 1 and 2 .

	complex 1	complex 2 a
Ir1—C1	2.157 (5)	2.207 (3)
Ir1—C4	1.891 (6)	1.874 (4)
Ir1—P1	2.344 (1)	2.347 (1)
Ir1—P4	2.315 (2)	2.332 (1)
Ir1—H1	1.54 (3)	1.52 (4)
C4—O1	1.117 (7)	1.135 (5)
P1—C2	1.827 (5)	1.837 (4)
P2—C2	1.800 (5)	1.803 (4)
P2—C1	1.697 (5)	1.802 (3)
P3—C1	1.711 (5)	1.801 (3)
P2—C1—P3	125.7 (3)	122.1 (2)
P2—C1—Ir1	113.9 (3)	107.8 (2)
P3—C1—Ir1	120.4 (3)	114.5 (2)
P4—Ir1—P1	170.7 (1)	171.9 (1)

Note: (a) the second independent formula unit displays similar values.