The crystal and molecular structure of zinc lactate trihydrate

Abstract

Zn(CHaCHOHCOO)2.3H20 is monoclinic, space group P21/c, with a=9"38, b=5-83, c=22-00 /~; ,6= 90.9 °, Z= 4. The structure was solved by Patterson and Fourier methods and refined by full-matrix least-squares calculations to a final R of 0"105 for 1434 visual reflexions. The molecular dimensions are normal. The corresponding bond lengths in the bidendate lactate groups agree well with each other. Six oxygen atoms, four from lactate groups and two from water molecules, form a distorted octahedron round the zinc atom. The average Zn-O distance is 2.11 A,. All three water molecules take part in hydrogen-bond formation.

EPR and optical absorption studies on VO2+ ions in zinc lactate trihydrate

“…The optical absorption study provides the energy level structure of the metal ion. A study of metal complexes of lactic acid gives the influence of metal ions on the conformation of lactic acid and structural data for the elucidation of its function in biological systems [3].…”

ESR and optical study of Mn2+-doped zinc lactate trihydrate

“…This is also supported by optical absorption study result. The band assigned to 6 A 1g (S)-4 E g (G), 4 A 1g (G) is sharp, but does not exhibit any splitting. According to theory, the degeneracy of 4 E g (G), 4 A 1g (G) level is expected to be lifted in tetragonal or rhombic, but not in trigonal distortion.…”

“…ZLT crystals are grown [4] at room temperature by slow evaporation of aqueous solution of lactic acid and zinc oxide in stoichiometric ratio. To grow the Mn 2+ doped crystals 0.1 wt% of manganese sulphate are added to the mixture.…”

“…Four oxygen atoms from the two lactate groups and two from water molecules are the six nearest neighbours of Zn. They form a distorted octahedron [4]. All three water molecules enter into hydrogen bond formation.…”

“…The crystal structure [4] of ZLT contains four zinc atoms. If one assumes that Mn 2+ ion enters the ZLT lattice substitutionally in Zn position, one can expect from crystal structure data four magnetically distinct sites per unit cell in the ab and bc* planes while they are equivalent in the c*a plane.…”