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The non-centrosymmetric materials Zn(IO 3 ) 2 , Mn(IO 3 ) 2 , Co(IO 3 ) 2 , Mg(IO 3 ) 2  and β-Ni(IO 3 ) 2  have been synthesised by evaporation of nitric acid solutions of metal salts and lithium iodate. All these compounds are isostructural and their structures were characterised both by X-ray diffraction on powder and single crystals. They crystallise in the monoclinic crystal system, space-group type  P 2 1  (no. 4) with a pseudo-hexagonal lattice, as shown by the lattice parameters of Mn(IO 3 ) 2  for example:  a  = 11.247(1) Å,  b  = 5.045(1) Å,  c  = 11.246(1) Å, β = 120.02(1)°,  V  = 552.5(1) Å 3 , Z = 4. This monoclinic symmetry with  a  ∼  c  and β ∼ 120° leads to a three-individual pseudo-hexagonal twin by pseudo-merohedry. The structure reveals a three-dimensional network in which each octahedrally coordinated cation is linked to ten others  via  iodate bridges. All these metal iodates generate second harmonics.

Crystal structure of M(IO 3 ) 2 metal iodates, twinned bypseudo-merohedry, with M II : Mg II , Mn II , Co II , Ni II and Zn II