The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 41459-42-1, Name is 3-Bromo-2-(bromomethyl)propanoic acid, SMILES is O=C(O)C(CBr)CBr, in an article , author is Xing, Wenhao, once mentioned of 41459-42-1, Recommanded Product: 3-Bromo-2-(bromomethyl)propanoic acid.
Evaluation of nonlinear optical properties of quaternary chalcogenide halides Ba4Si3Se9Br2 and Ba4Ge3Se9Br2
The quaternary chalcogenide halides Ba4Si3Se9Br2 and Ba4Ge3Se9Br2 were obtained in the form of crystals from reactions of binary selenides and bromides at 1173 K and in the form of phase-pure polycrystalline samples from reactions at 1023 K. They adopt noncentrosymmetric crystal structures, as determined from single-crystal X-ray diffraction data (hexagonal, space group P6(3), Z = 2; a = 10.1672 (5) angstrom, c = 12.4362 (6) angstrom for Ba4Si3Se9Br2; a = 10.2345 (4) angstrom, c = 12.5306 (5) angstrom for Ba4Ge3Se9Br2). The structures contain discrete Tt(3)Se(9)(6-) rings (Tt = Si, Ge) which are built up from corner-sharing TtSe(4) tetrahedra and which are separated by Ba2+ and Br- ions. Relative to the benchmark infrared nonlinear optical (NLO) material AgGaS2, the second harmonic generation (SHG) response is more intense for Ba4Si3Se9Br2 (3.2 x ) and Ba4Ge3Se9Br2 (3.5 x ) over particle sizes of 20-40 mm. The measured optical band gaps are 2.96 eV for Ba4Si3Se9Br2 and 2.60 eV for Ba4Ge3Se9Br2. Both compounds melt congruently (778 degrees C for Ba4Si3Se9Br2 and 731 degrees C for Ba4Ge3Se9Br2). The calculated birefringence is small, which accounts for the non-phase-matching behaviour observed experimentally. (C) 2020 Elsevier B.V. All rights reserved.
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