Planejamento de novas formas cristalinas com propriedades desejadas em óptica não linear através da protonação da trans-1,2-di(4-piridil)etileno
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2017-10-10
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Universidade Federal de Goiás
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This work investigates the trending of crystallization in non-centrosymmetric space
groups to study second harmonic generation (SGH) in the field of non linear
optics. Using trans-1,2-di(4-pyridil)ethylene (BPE) four unpublished compounds
were obtain, being them BPEH2Cl2·2H2O (1), BPEH2Br2 (2), BPEH2(H2PO4)2
(3) e BPEH2(H2PO4)2·H3PO4 (4). In these structures was possible to analyse
the pattern of formed synthons, which showed to be function of geometry and
polarizability and not only of acid strength of acid that generates the counter ion.
The structure 1 showed pseudo symmetry and had the space group determined by
the combination of observed signal of second harmonic generation and statistical
parameters of refinement in different space groups. Under the incidence of LASER
with emission on 974 nm it was observed a signal dependent of the incident power
in 487 nm for single crystals of these structure, proving the absence of inversion
center in 1. All structures were characterized by single-crystal X-ray diffraction
(SXRD), with additional caracterizations for structure 1 using the techniques X-ray
powder diffraction (PXRD), photoluminescence, measurement of second harmonic
generation signal and theorical calculation of SHG effects and eletrical properties.
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VALDO, Ana Karoline Silva Mendanha. Planejamento de novas formas cristalinas com propriedades desejadas em óptica não linear através da protonação da trans-1,2-di(4-piridil)etileno. 2017. 52 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2017.