Table 1. Selected bond lengths (Å) and angles (°) of 2-Py, 3-Py, 4, and 5.

	2-Py	3-Py	4	5 a
Ni–N2	1.868(2)	1.889(1)	1.858(5)	1.844(2)
Ni–N6	1.807(2)	1.836(1)	1.869(5)	1.877(3)
Ni–N10	1.924(2) b	1.883(2)	1.858(4)	1.848(3)
Ni–N11	1.902(2)	1.921(1)	—	—
N2–N3	1.356(3)	1.343(1)	1.370(6)	1.324(4)
N3–C4	1.315(4)	1.322(2)	1.314(7)	1.337(3)
C25–C26	1.376(5)	1.369(2)	1.395(7)	1.353(5)
C8–N9	1.334(4)	1.322(2)	1.317(7)	1.342(5)
N9–N10	1.412(3)	1.342(2)	1.366(7)	1.323(3)
N2–Ni1–N10	171.1(1) c	177.18(6)	170.5(2)	171.8(1)
N2–Ni1–N6	89.5(1)	89.31(6)	94.7(2)	94.0(1)
N10–Ni1–N6	82.0(1)	88.97(6)	94.8(2)	94.1(1)

^aOnly one of the two independent molecules are listed.

^bNi1–N9.

^cN2–Ni1–N9.