New quiolinium polymorph with optimal packing for maximal off-diagonal nonlinear optical response

The influence of polymorphism on the nonlinear optical properties of HMQ-MBS (2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-methoxybenzenesulfonate) crystals is investigated. By changing the solvent for crystal growth, a new polymorph has been found. While the previously reported α-phase of HM...

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Bibliographic Details
Published in:Dyes and pigments 2013-02, Vol.96 (2), p.435-439
Main Authors: Lee, Seung-Heon, Jazbinsek, Mojca, Yun, Hoseop, Kim, Jong-Taek, Lee, Yoon Sup, Kwon, O-Pil
Format: Article
Language:English
Subjects:
Crystal growth
Crystals
Electro-optics
Group theory
Molecular packing
Nonlinear optics
Nonlinearity
Optical properties
Optimization
Organic crystals
Polymorphism
Solvents
Symmetry
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Summary:The influence of polymorphism on the nonlinear optical properties of HMQ-MBS (2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-methoxybenzenesulfonate) crystals is investigated. By changing the solvent for crystal growth, a new polymorph has been found. While the previously reported α-phase of HMQ-MBS, having monoclinic Pc space group symmetry exhibits an optimal molecular packing for maximizing the diagonal component of the second-order nonlinear optical response, the β-phase of HMQ-MBS has monoclinic Pn space group symmetry and exhibits an optimal molecular packing for maximizing the off-diagonal response. HMQ-MBS is therefore a very interesting compound for a wide range of second-order nonlinear optical applications. HMQ-MBS exhibits two interesting acentric polymorphs for second-order nonlinear optical applications. In one phase the chromophores pack in an optimal way to maximize the off-diagonal nonlinear susceptibility response, while in the other phase optimally to maximize the diagonal response. [Display omitted]
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2012.08.022