Fig. 3. Solid-state structures of 4 (front view) and 5 (side view). For clarity, all hydrogen atoms except the pyrrole N–Hs and all solvent molecules are omitted (displacement ellipsoids are drawn at 50% probability). Selected bond lengths (Å) for 4: U1–O1 1.864(2), U1–O2 1.909(2), O1–N4 2.889(3), O1–N5 3.040(3). O1–U1–O2 bond angle: 174.21(9)°. Selected bond lengths for 5: U1–O1 1.88(1), U1–O2 1.90(1), Ca1–O2 2.33(1), O1–N4 2.95(2), O1–N5 2.92(2). O1–U1–O2 bond angle: 176.0(6)°.
