The structure of the complex MgCr2O7.2[(CH2)6N4].6H2O has been determined by X‐ray diffraction to study the hydrogen bonds and the role of water in the crystal stabilization. The crystals are triclinic, space groupPĪ, witha= 10.02 (5),b= 13.68 (8),c= 9.81 (5) Å, α = 961 (5), β = 87.9 (5), γ = 101.0 (8)°,Z= 2 (MoKα radiation up to (sin θ)/λ = 0.691 Å−1with Weissenberg photographs). The crystal structure has been determined by the heavy‐atom method and refined by full‐matrix least‐squares calculations. The finalRis 0.067 (0.088 with non‐observed reflexions). The structure is characterized by two nearly tetrahedral CrO4groups joined through a shared oxygen atom, an octahedron [Mg(H2O)6]2+and two hexamethylenetetramine molecules, lin