Synthesis, crystal structure and thermal decomposition of the new cadmium selenite chloride, Cd4(SeO3)2OCl2.

A synthetic study in the Cd-Se-O-Cl system led to formation of the new oxochloride compound Cd4(SeO3)2OCl2 via solid state reactions. The compound crystallizes in the orthorhombic space group Fmmm with cell parameters a = 7.3610(3) Å, b = 15.4936(2) Å, c = 17.5603(3) Å, Z = 8, S = 0.969, F(000) = 2800, R = 0.0185, Rw = 0.0384. Single crystal X-ray data were collected at 293 K. The crystal structure can be considered as layered and the building units are distorted [Cd(1)O6] octahedra, distorted [Cd(2)O8] cubes, irregular [Cd(3)O4Cl2] polyhedra and SeO3E trigonal pyramids. There are two crystallographically unique Cl atoms that both are half occupied. Thermogravimetric studies show that the compound starts to decompose at 500°C. The crystal structure of the new compound is closely related to the previously described compound Cd4(SeO3)2Cl4(H2O).

Structural and thermal characterization of a semiorganic NLO material: L-alanine cadmium chloride.

L-Alaninium cadmium chloride (LACC), a semiorganic nonlinear optical material has been synthesized and its single crystal grown and characterized for its thermal, structural, linear and second order nonlinear optical properties. Powder SHG study shows that LACC is 1.5 times efficient as KDP. Its optical transparency goes down to 200 nm comparable to the typical borate crystals like potassium pentaborate.