Table 2. Selected Bond Lengths (Å) and Bond Angles (deg) for 4, 4^2–, and 5.

	4	42–	5
Al1–N1	1.9336(9)	1.871(2)	1.893(2)
Al1–N4	1.9334(8)	1.873(2)	1.900(2)
Al–C21	1.962(1)	2.011(2)
Al–C27	1.957(1)	2.011(2)
Al–I1			2.497(7)
Al–I2			2.494(7)
N1–N2	1.315(1)	1.432(2)	1.317(2)
N2–C7	1.346(1)	1.332(2)	1.344(3)
C7–N3	1.347(1)	1.328(2)	1.346(3)
N3–N4	1.307(1)	1.432(2)	1.313(2)
N1–C1	1.433(1)	1.375(2)
N4–C15	1.430(1)	1.371(3)
N1–Al1–N4	90.01(4)	98.54(7)	92.83(8)