Table 2. Comparison of bond lengths (Å) for V(v) complexes with glutaroimide-dioxime (H₂L), 4-hydroxydipicolinic acid (H₂Dpa-OH), and (S,S)-2,2′-(hydroxyimino)dipropionic acid (H₃HIDPA).

Bond type	K[VO2(DpaOH)]·H2O	Na[VO2(HL)] a	Na[V(L)2]·2H2O b	[PPh4][Δ-V(HIDPA)2)]·H2O
V–O1 (oxido)	1.606(5)	1.6781(15)	1.8667(6)	1.993(9)
V–O2 (oxido)	1.616(5)	1.6734(14)	1.8740(6)	1.96(1)
V–O3	2.033(5)	2.0054(13)	1.9024(6)	1.977(9)
V–O4	1.990(5)	1.8931(14)	1.9036(6)	1.941(9)
V–O5	—	—	—	1.926(9)
V–O6	—	—	—	1.973(9)
V–N1	2.089(6)	1.9885	1.9550(7)	2.02(1)
V–N4	—	—	1.9558(7)	2.00(1)

^aThe V–O3 and V–O14 bonds shown in Fig. 3 for Na[VO₂(HL)](cr) have been renumbered in this table as V–O1 and V–O2 to allow ease of comparison with other oxido bond lengths.

^bThe numbering of V–O and V–N bonds in Na[V(L)₂]·2H₂O(cr) is consistent with those listed in Fig. 2.