SYNTHESIS, STRUCTURE AND PROPERTIES OF A NEW NONLINEAR OPTICAL MATERIAL: ZINC CADMIUM TETRATHIOCYANATE

摘要

In this communication, a new nonlinear optical crystal of coordination com- plex, zinc cadmium tetrathiocyanate (ZnCd(SCN)_4), is reported. It was suc- cessfully synthesized through several reactions in water. For the crystal structure, optical and thermal characterization were determined by elemental analysis, X-ray diffraction, infrared spectroscopy, differential scanning calo- rimeter, thermogravimetric analysis, and transmission spectrum. It belongs to the tetragonal system, space group I4, with a = ll.l35(2), c = 4.3760(l0) A, and z = 2. It exhibits powder SHG efficiencies superior to that of cadmium mercury thiocyanate (CMTC) and over l0 times that of urea, and the UV transparency cutoff is 290 nm, which is shifted to violet band 90 nm, com- pared with that of CMTC.