Powder second harmonic generation measurement and thermal decomposition mechanisms of a new organometallic compound [(18C6)Li] [Cd(SCN)_3]

摘要

Single crystals of a novel nonlinear optical organometallic compound CLTC, ([(18C6)Li][Cd(SCN)_3]), were grown from aqueous solutions via evaporation technique and characterized by IR spectroscopy, thermal gravimetric analysis and X-ray single-crystal diffraction. By X-ray single-crystal structural analysis it is revealed that the compound crystallized in a noncentrosymmetric space group Cmc2_1 of orthorhombic system with cell parameter a = 14.767(3) _, b = 15.454(3) _, c = 10.644(2) _, V = 2429.0(8) _~3 and Z = 4. The thermal stability and thermal decomposition of CLTC crystal were investigated by means of thermogravimetry and differential thermal analysis. The second harmonic generation (SHG) efficiency was measured using the Kurtz and Perry powder technique. It was shown that the value of the SHG efficiency of CLCT powder was about 2 times higher than that of potassium dihydrogen phosphate (KDP).