Table 1. Comparison of Selected Bond Lengths (Å) and Angles (°) for 3c (the First Polymorph) and 5.

radical 3c	values	diradical 5	values
O(1)–N(1)	1.2822(15)	O(1)–N(1)	1.288(8)
N(1)–C(10)	1.4330(16)	N(1)–C(1)	1.427(7)
N(1)–C(13)	1.4890(16)	N(1)–C(7)	1.489(8)
O(1)–N(1)–C(10)	115.38(11)	O(1)–N(1)–C(1)	116.09(8)
O(1)–N(1)–C(13)	119.21(10)	O(1)–N(1)–C(7)	118.54(4)
C(10)–N(1)–C(13)	123.69(11)	C(1)–N(1)–C(7)	123.52(4)