The crystal structure of manganese (II) L-tartrate tetrahydrate MnC₄H₄O₆ · 4 H₂O

Abstract

The crystal structure of manganese (II) L-tartrate tetrahydrate has been determined and refined by three-dimensional least-squares methods. The crystals are orthorhombic, space group P2 { with a = 6.092(5), b = 12.285(7), c = 7.285(4) Ä, β = 112°, and two molecules per unit cell. Photographic data refined to R = 0.078. Each manganese atom is surrounded by six oxygen atoms, four from two chelate rings of two tartrate ions, two water molecules.

Crystal Structures and Thermal Properties of L-MnC4H4O6•2H2O and DL-MnC4H4O6•2H2O

“…The observed lattice constants of L-MnC 4 H 4 O 6 • 2H 2 O differ from those of MnC 4 H 4 O 6 • 4H 2 O previously reported by Soylu (Soylu, 1985), and are very close to those of MnC 4 H 4 O 6 • 2H 2 O reported by Labutina et al (Labutina, Marychev, Portnov, Somov, & Chuprunov, 2011). This difference is considered to be attributed to the difference in the number of bound water molecules contained in the crystals.…”

“…Experimental studies on manganese tartrate crystals (containing two or four water molecules) were conducted as follows (Labutina, Marychev, Portnov, Somov, & Chuprunov, 2011;Soylu, 1985;Yanes, Lopez, Stockel, Peraza, & Torres, 1996). Soylu has reported the crystal structure of MnC 4 H 4 O 6 • 4H 2 O at room temperature determined by single-crystal X-ray diffraction (Soylu, 1985). The structure was found to be monoclinic with space group P2 1 , the lattice constants being a = 6.092(5), b = 12.285(7), c = 7.295(4) Å and β = 112°, and consisted of strongly disordered MnO 6 octahedra and C 4 H 4 O 6 molecules.…”

Weak ferromagnetism in manganese tartrate dihydrate MnC4H4O6·2H2O

“…The literature concerning manganese tartrate crystallographic structure is inconclusive. The same lattice parameters and spatial group have been reported for the compound with two, three and four water molecules [13][14][15]. Since details of the crystal structure of the Mn compound are unknown we have to rely on the reported structure from some supposedly isomorphous compounds such as cadmium tartrate [1] that has two molecules per unit cell.…”