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| Na1—O1 | 2.462 (3) | Na2—O7 | 2.372 (3) |
| Na1—O3 | 2.374 (3) | Na2—O8iii | 2.569 (4) |
| Na1—O4 | 2.552 (3) | Na2—O8 | 2.510 (3) |
| Na1—O5 | 2.351 (3) | O1—C1 | 1.274 (4) |
| Na1—O6 | 2.385 (4) | O2—C1 | 1.247 (4) |
| Na1—O8i | 2.857 (4) | O3—C7 | 1.256 (5) |
| Na2—O3 | 2.315 (3) | O4—C7 | 1.264 (5) |
| Na2—O4ii | 2.431 (3) | N1—N2 | 1.478 (4) |
| Na2—O5ii | 2.373 (3) | N3—N4 | 1.476 (4) |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
