The title compound (C₁₀H₉N₂)[Cr(C₆H₇NO₆)₂](C₁₀H₈N₂)∙2H₂O or (4,4´-bipyH)[Cr(ntaH)₂](4,4´-bipy)∙2H₂O (ntaH₃ is nitrilotriacetic acid) was synthesized by reaction of Cr(NO₃)₃∙9H₂O with 4,4´-bipyridine, and nitrilotriacetic acid with 4:2:1 molar ratio in aqueous solution. The crystal structure of this complex was identified using X-ray crystallography. The unit cell parameters are as follows:

a = 9.8501(3) Å, b = 13.157(2) Å, c = 26.842(4) Å, β = 104.807(7)°.

The final R value is 0.041 for 7747 independent reflections. The title compound crystallized in monoclinic system and belongs to P2₁/c space group.  The central Cr^III atom is coordinated by two tridentaid (ntaH₂) ligands and the resulted CrO4N2 set can be described as distorted octahedral geometry. The asymmetric unit contains two half of anionic complex, one 4, 4´-bipyridiniom ion, (4, 4´-bipyH)⁺, one neutral 4, 4´-bipyridine molecule and two non-coordinated water molecules. Intramolecular hydrogen bonds, π-π [centroid –centroid distances of 3.674 Ǻ], C-H…π, O-H…π and N-H…π stacking interactions [with distance of 3.714, 3.736 and 3.270 Å respectively], connect the various components into a supramolecular structures.