Table 2. Bond Lengths and Angles within the Coordination Sphere of the Er^III Ion in Compound 2.

	bond length (Å)		angle (°)
Er–O1	2.155(3)	O1–Er–O2	137.9(1)
Er–O2	2.137(4)	O2–Er–O3	111.3(1)
Er–O3	2.090(4)	O3–Er–O1	110.6(1)
Er–N1	2.461(8)	O1–Er–N1	84.4(2)
Er–N2	2.503(6)	O2–Er–N1	85.4(2)
N3–N4	1.227(8)	O3–Er–N1	98.2(2)
		O1–Er–N2	85.7(2)
		O2–Er–N2	84.9(2)
		O3–Er–N2	109.2(2)
		N1–Er–N2	152.6(2)