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a) Crystal structure of Zr(L1)4. Selected bond lengths (Å) and angles (°): Zr1-O1, 2.209; Zr1-O2, 2.170; O1-Zr1-O1, 69.73; N1-O1-Zr1, 113.49; C1-O2-Zr1, 117.68. b) View of H-bond between amide proton and adjacent oxygen donor. c) Representation of the angle formed between the plane of Zr1-O4-O5 and the HOPO ring. d) View of Amide/HOPO ring π stacking. Water molecules and hydrogen atoms omitted for clarity. Crystallographic summary available in ESI, Table S1.44
