Crystal structure of magnesium(II) diaquatetracarbamidenitrate

Magnesium(II) diaquatetracarbamidenitrate nitrate was structurally studied. Crystals of composition [Mg(H2O)(2)(ur)(4)](NO3)(2) (I) are monoclinic, Z = 2, P2(1)/n, a = 6.449(1) , b = 17.670(2) , c = 7.578(1) ; beta = 91.637(2)A degrees. In the structure of complex I, the central magnesium atom has octahedral geometry: the four carbamide molecules are in equatorial positions, and water molecules occupy axial positions.