Figure 1 Coordination environment of Er1 in compound I with labelling and displacement ellipsoids drawn at the 30% probability level. Symmetry codes: (i) 2.25 - x, 0.25 - y, z; (ii) 1.25 - x, y, 1.25 - z; (iii) 1.25 - x, 0.25 - y, z; (iv) 1.5 - x, 0.5 - y, 1 - z; (v) -0.25 + x, -0.25 + y, 1 - z; (vi) 1 + x, y, z; (vii) 2 - x, -y, 1 - z; (viii) x, 0.25 - y, 1.25 - z; (ix) -1 + x, y, z; (x) -0.75 + x, 0.25 + y, 1 - z.  [article HTML]