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Figure 4
Solid-state UV–Vis diffuse reflectance (a) and absorption (b) spectra of the Py(PO3Et2)4 ligand (black), IEF-33 (red) and IEF-34 (blue).

IUCrJ
Volume 13| Part 6| November 2026| Pages 843-851
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526009875