. 2017 Jun 2;73(Pt 7):932–935. doi: 10.1107/S2056989017007812

Table 2. Comparison of N_imine—C_imine, C_imine—C_ipso, and C_ipso—N_pyridine bond lengths (Å).

Compound	N_imine—C_imine	C_imine—C_ipso	C_ipso—N_pyridine
α-IP^a	1.28	1.47	1.35
α-IP²⁻ ^a	1.46	1.39	1.40
PDI^b	1.271 (17)	1.480 (19)	1.345 (17)
PDI²⁻ ^b,c	1.363	1.443	1.332
This work	1.283 (3)	1.500 (4)	1.361 (5)

Notes: (a) survey of Lu et al. (2008 ▸); (b) Bart et al. (2006 ▸); (c) bond lengths confirmed using ab initio studies.

Table 2. Comparison of Nimine—Cimine, Cimine—Cipso, and Cipso—Npyridine bond lengths (Å).