Table 3. Selected bond lengths (Å) for (II) .
| Er1—O11 | 2.306 (7) | Er1—O12C i | 2.287 (6) |
| Er1—O11C | 2.312 (8) | Er1—O11A ii | 2.300 (6) |
| Er1—O12A | 2.317 (7) | Er1—O11B ii | 2.348 (6) |
| Er1—O12B | 2.239 (6) |
Symmetry codes: (i) 
; (ii) 
.
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