Synthesis and characterization of a new metal-organic NLO material: Dibromo bis(triphenylphosphine oxide) mercury(II)

Abstract A new metal-organic nonlinear optical dibromo bis(triphenylphosphine oxide) mercury(II) (HgBr 2 (TPPO) 2 , TPPO = triphenylphosphine oxide) crystal has been synthesized. Single-crystal X-ray diffraction reveals that HgBr 2 (TPPO) 2 crystallizes in the orthorhombic system, space group Pna 2 1 , a  = 21.174 A, b  = 9.1979 A, c  = 17.468 A, and Z  = 4. The crystal was also characterized by FTIR spectroscopy, differential scanning calorimetry (DSC), thermal gravity analysis (TGA), and UV–vis–IR spectroscopy. Thermal analyses confirmed that the crystal is stable up to 151 °C. The transmission spectrum of the crystal shows that the lower cut off wavelength lies at 340 nm. The nonlinear optical (NLO) property of HgBr 2 (TPPO) 2 has been estimated by Kurtz-powder second harmonic generation (SHG) test.