Table 1. Selected bond lengths (Å) for (I) .
| Er1—O1W | 2.373 (2) | Er1—O12A | 2.333 (3) |
| Er1—O2W | 2.295 (3) | Er1—O12B | 2.385 (3) |
| Er1—O11A | 2.477 (3) | Er1—O12C | 2.232 (3) |
| Er1—O11B | 2.478 (3) | Er1—O11C i | 2.233 (4) |
Symmetry code: (i) 
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