Single crystals of zinc magnesium tetra thiocyanate [ZnMg(SCN) 4 ], a bimetallic thiocyanate complex, were grown by slow evaporation solution growth technique at room temperature. The bright, transparent and colourless crystals have well defined faces. The grown crystals were characterized through elemental analysis, powder X-ray diffraction (XRD), thermogravimetric (TG) and differential thermal analysis (DTA), differential scanning calorimetric analysis (DSC), Fourier Transform Infra red (FTIR) and Optical studies. The elemental analysis confirms the stoichiometry of the synthesized crystals. The compound crystallizes under monoclinic structure with lattice parameters a = 10.055 Å, b = 7.44 Å, c = 6.00 Å and β = 90.113°. The TGA indicates 25 % weight loss at 205°C from which the decomposition pattern is formulated. The DSC study indicates that the crystal undergoes only first order phase transitions. The FTIR spectrum indicates among others the presence of metal-nitrogen and metal-sulphur bonds thus confirming the formation of the complex. The second harmonic-generation (SHG) was confirmed by the emission of green radiation using Nd: YAG laser.

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Zinc I 1700 Synthesis, Spectral and Thermal Properties of Non-Linear Optical Crystal ZnMg(SCN) 4 . -Bright, colorless and transparent single crystals of the title compound with an average size 0f 10 x 8 x 4 mm 3 are prepared by the slow evaporation solution growth method from aqueous solutions of ZnCl2, MgCl2·H2O, and NH4CNS in the molar ratio of 1:1:4 (room temperature, 10 d). The crystals are characterized by powder XRD, TG, DTA, DSC, FTIR, and optical measurements. The compound crystallizes in the monoclinic space group P 2 . The synthesized crystals have good second harmonic-generation properties which may lead to several industrial and research applications. -(KANNAN*, R. B.; CHANDRAMOHAN, A.; SEKAR, J. C.; KANDHASWAMY, M. A.; Cryst.