Table 1.

Comparison of interatomic distances [Å] for compounds 1 a–3 a and 1 b–3 b.

	1 a	2 a	3 a	1 b	2 b	3 b
Pn−N	1.757(1)	1.759(2)	1.749(2)	1.862(3)	1.898(1)	1.874(2)
Pn−O	1.659(1)	1.830(1)	1.855(2)	1.933(4)	2.028(1)	1.995(2)
	1.652(1)	1.978(1)	1.931(2)	1.933(4)	1.963(1)	2.051(2)
Pn−Nu	N. A.	1.652(1)	1.764(2)	N.A.[a]	1.820(1)	1.924(2)

[a] N.A.=not applicable.