Fig. 1. Solid-state structures of 1 (side view), 2 and 3 (both front view). For clarity, all hydrogen atoms except pyrrole N–Hs and all solvent molecules are omitted (displacement ellipsoids are drawn at 50% probability). Selected bond lengths (Å) for 1: U1–O1 1.846(6), U1–O2 1.925(6), O1–N4 3.09(1), O1–N5 3.02(1). O1–U1–O2 bond angle: 175.3(3)°. Selected bond lengths (Å) for 2: U1–O1 1.841(2), U1–O2 1.979(3), O1–N4 3.021(4), O1–N5 3.099(3). O1–U1–O2 bond angle: 177.43(9)°. Selected bond lengths (Å) for 3: U1–O1 1.829(8), U1–O2 1.995(7), O1–N4 3.09(1), O1–N5 3.01(1). O1–U1–O2 bond angle: 176.7(3)°.
