Table 1.

Selected interatomic distances (Å) and angles (°) from the crystal structures shown in Figure 2. Atom X represents the axial atom, either O4 or N3.

	Complex
	9-NO3	10-BF4	11	13
Re–N1	2.178(4)	2.182(2)	2.180(3)	2.210(3)
Re–N2	2.178(4)	2.180(2)	2.175(3)	2.200(3)
Re–X	2.154(4)	2.149(2)	2.191(2)	2.196(2)
Re–C1	1.899(6)	1.917(3)	1.896(3)	1.896(4)
Re–C2	1.915(6)	1.927(3)	1.921(4)	1.929(4)
Re–C3	1.916(6)	1.929(3)	1.924(4)	1.928(4)
C1–O1	1.163(7)	1.147(3)	1.149(4)	1.147(5)
C2–O2	1.157(7)	1.145(3)	1.154(4)	1.150(4)
C3–O3	1.152(7)	1.144(3)	1.150(4)	1.148(5)
N1–Re–N2	74.60(15)	74.42(7)	75.68(9)	76.18(9)
N1–Re–X	87.73(14)	82.77(8)	79.09(9)	77.99(9)
N1–Re–C1	93.68(19)	94.18(9)	92.69(12)	98.36(15)
N1–Re–C2	99.00(2)	99.72(11)	98.09(13)	100.72(13)
C2–Re–C3	89.0(2)	87.77(13)	89.02(16)	82.84(17)