Table 1. Pyrrole N–H ¹H NMR shifts and bond distances of the U–O_exo and O_endo–N_H bonds in uranyl(v) complexes B–D,178 and 9.

Entry	Li–O–UV O B	Na–O–UV O C	K–O–UV O D	Rb–O–UV O 8	Cs–O–UV O 9
δ H (N–H, ppm)	85.48	91.11	93.06	92.37	92.21
d U–Oexo (Å)	1.884(7)	1.856(7)	1.837(2)	1.837(3)	1.833(6)
d Oendo–NH (Å)	3.09(1), 3.10(1)	3.010(9), 2.988(8)	2.898(4), 2.932(4)	2.940(5), 2.906(5)	3.01(1), 2.92(1)