Skip to Main content Skip to Navigation
Journal articles

Bent HgI2 Molecules in the Melt and Sulfide Glasses: Implications for Nonlinear Optics

Abstract : Nonlinear optical (NLO) crystals are widely used in advanced photonic technologies for second harmonic and difference frequency generation (SHG and DFG, respectively), producing coherent light at frequencies where existing lasers are unavailable. Isotropic glasses do not exhibit SHG or DFG, except temporarily induced anisotropy under external stimuli. However, recent reports on glasses with chiral structural motifs show promising permanent NLO properties. We propose an alternative solution hybrid molecular/network glasses with noncentrosymmetric HgI2 monomers. Mercury (II) iodide consists of linear HgI2 triatomic molecules in the vapor phase and in the yellow orthorhombic polymorph stable above 400 K. At lower temperatures, the tetragonal red form is composed of corner-sharing HgI4/2 tetrahedra forming a layered extended framework. There is a gap in the molecular evolution; direct structural measurements of the liquid HgI2 phase are missing. Using high-energy X-ray scattering, pulsed neutron diffraction, and Raman spectroscopy supported by structural and vibrational modeling, we show that the mercury(II) iodide melt and HgI2-containing sulfide glasses are built up by bent HgI2 monomers (the bond angle
Complete list of metadatas

Cited literature [89 references]  Display  Hide  Download
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, September 10, 2019 - 11:40:14 AM
Last modification on : Wednesday, October 14, 2020 - 3:45:40 AM
Long-term archiving on: : Friday, February 7, 2020 - 11:51:28 PM


Kassem et al-2019-Bent HgI2 Mo...
Files produced by the author(s)



Mohammad Kassem, Maria Bokova, Andrey S. Tverjanovich, Daniele Fontanari, David Le Coq, et al.. Bent HgI2 Molecules in the Melt and Sulfide Glasses: Implications for Nonlinear Optics. Chemistry of Materials, American Chemical Society, 2019, 31 (11), pp.4103-4112. ⟨10.1021/acs.chemmater.9b00860⟩. ⟨hal-02177797⟩



Record views


Files downloads