Table 1. Bond Lengths and Angles of the Coordination Spheres of Er^III Ions in Compound 1.

	central ErIII(x = 1)	“right”a terminal ErIII(x = 2)	“left”a terminal ErIII(x = 3)
bond lengths (Å)
Erx–Ox1	2.095(5)	2.056(5)	2.056(4)
Erx–Ox2	2.145(5)	2.094(4)	2.089(4)
Erx–Ox3	2.142(5)	2.089(5)	2.085(4)
Erx–Nx1	2.519(5)	2.459(6)	2.461(5)
Erx–Nx2	2.499(6)
angles (°)
Ox1–Erx–Ox2	112.98(19)	122.37(18)	109.79(17)
Ox1–Erx–Ox3	110.98(19)	107.51(18)	118.24(17)
Ox3–Erx–Ox2	136.04(18)	122.34(18)	125.22(17)
Ox1–Erx–Nx4	104.3(2)	105.67(19)	109.17(18)
Ox3–Erx–Nx4	84.32(19)	109.49(18)	87.60(18)
Ox2–Erx–Nx4	84.66(19)	84.43(19)	100.62(17)
Ox1–Erx–Nx5	107.3(2)
Ox3–Erx–Nx5	82.55(19)
Ox2–Erx–Nx5	85.0(2)
Nx5–Erx–Nx4	148.28(19)

^a“Right” and “left” refer to the positions of the terminal Er^III ions as shown in Figure 3.