416Numerous magnesium complexes with carbamide, formamide, acetamide, and dimethylcarbamide have been studied in a detailed way. The structural variety of magnesium(II) complexes with carbamide type ligands prepared from water-organic systems may be reduced to a few species that are conventionally described as [Mg(H 2 O) 2 (ur) 4 ] 2+ [1] and [Mg(ur) 6 ] 2+ [2-5]. We have also described a compound which con tains both [Mg(ur) 6 ] 2+ and [Mg(H 2 O) 4 (ur) 2 ] 2+ cations [6], where the apical arrangement of the carbamide type ligand is characteristic of the latter. The complex [Mg(H 2 O)(L)(ur) 4 ] (L = ) has the most interest ing configuration of the inner coordination sphere [7], where water molecules and the bulky sulfato group are positioned nonapically.This study deals with the crystal structure of the magnesium nitrate complex with carbamide, Mg(NO 3 ) 2 ⋅ 4CO(NH 2 ) 2 ⋅ 2H 2 O, which is produced by reacting magnesium nitrate and carbamide in aqueous media.
EXPERIMENTALSingle crystals of Mg(NO 3 ) 2 ⋅ 4CO(NH 2 ) 2 ⋅ 2H 2 O were synthesized using magnesium nitrate hexahy drate (chemically pure grade) and carbamide (pure for analysis grade). For the reason that the complex is congruently soluble in water, the reagents were taken in a stoichiometric proportion (Mg(NO 3 ) 2 : CO(NH 2 ) 2 = 1 : 4) and dissolved in water at 50°С. The resulting aqueous solution was slowly concentrated at room temperature. Separated crystals of the complex were identified by chemical analysis, differential thermal analysis, and IR spectroscopy. SO 2 4 − X ray crystallography. An experimental data set for complex I was collected on a Bruker SMART APEX2 CCD diffractometer at 293 K(MoK α radiation) from a single crystal 0.30 × 0.20 × 0.15 mm. An absorption correction was applied using APEX2 software [8]. The Abstract-Magnesium(II) diaquatetracarbamidenitrate nitrate was structurally studied. Crystals of compo sition [Mg(H 2 O) 2 (ur) 4 ](NO 3 ) 2 (I) are monoclinic, Z = 2, P2 1 /n, a = 6.449(1) Å, b = 17.670(2) Å, c = 7.578(1) Å; β = 91.637(2)°. 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.
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