Table 1. Selected bond distances of related pentadentate Co and Zn complexes.

Complex a	Coordination environment b (M = Co, Zn)
	M–Nax	M–O	avg M–Neq	Tilt of axial heterocycle (°)
[(PY5Me2)Co(OH2)]2+ (ref. 10a )	2.103	2.055	2.139	4.60
[(PY5Me2)Zn(OH2)]2+ (ref. 10a )	2.116	2.056	2.162	11.26
[(CF3PY5Me2)Co(OH2)]2+ (ref. 10a )	2.132	2.050	2.129	9.88
1-Co, [(ax-PY4PZMe2)Co(OH2)]2+	2.1050(13)	2.0342(12)	2.1415(13)	7.58
1-Zn, [(ax-PY4PZMe2)Zn(OH2)]2+	2.147(3)	2.039(3)	2.160(4)	7.15
2-Co, [(eq-PY4PZMe2)Co(OH2)]2+	2.099(2)	2.0316(19)	2.127(2)	4.78
2-Zn, [(eq-PY4PZMe2)Zn(OH2)]2+	2.1368(19)	2.0608(17)	2.150(2)	2.24
3-Co, [(PY3PZ2Me2)Co(OH2)]2+	2.094(3)	2.016(3)	2.113(3)	5.67
3-Zn, [(PY3PZ2Me2)Zn(OH2)]2+	2.141(2)	2.0474(18)	2.157(2)	4.75

^aAll complexes recrystallized as the triflate salt.

^bBond distances are reported in angstroms (Å).